MV Giamani Liveaboard: Dive Sites Visited

Our website contains full dive site descriptions of all of the dive sites in Thailand, Burma (the Mergui Archipelago) and the Andaman Islands (India). Below are quick charts highlighting the areas this liveaboard boat visits. John Williams is the author of or has contributed to four books on diving in Thailand and Southeast Asia including a guidebooks for Lonely Planet, Periplus Editions, Asian Diver Magazine and Times Editions Singapore, winning awards for publishing.
At a Glance: The Similan Islands • Thailand • Liveaboard Destination • (More >>>) |
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Reef type: |
Huge granite boulders, coral sloping walls, pinnacles, sandy areas. Sand blinding white, looks and feels like sugar. |
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Distance from Phuket |
55-60nm or 110-120km. |
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Visibility: |
Great, averaging 20 to 30m, on good days over 40m. |
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What to look for:
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Unusual granite formations, dramatic scenery, swim-throughs, large seafans, gorgeous beaches. Wildlife includes monitor lizards, various snakes, squirrels, and bats, along with birds like Pacific reef egrets, Nicobar pigeons, Brahminy kites and white-breasted sea eagles. Corals excellent; unbelievable variety of both hard and soft. Multicolored, some of the best old hard coral growth in the world. Well protected. Many species of nudibranchs and other molluscs, colorful sponges and tunicates, as well as crustaceans like crabs, reef lobsters, and a wide variety of shrimp. Fusiliers and surgeonfish are common, as are groupers, wrasses, at least four species of lionfish. Home to a number of exotic, seldom seen fish, including frogfish, ghost pipefish, blue-spotted jawfish, firefish, and Andaman sweetlips. Jacks, mackerel, and dogtooth tuna harass the ever-present thick schools of baitfish. |
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At a Glance: Koh Bon • Thailand • Liveaboard Destination • (More >>>) |
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Reef type: |
Walls and a ridge on the main dive site. A pinnacle to the northwest of the ridge, not dived as often due to depth from the surface to the top of the rock (18m). The main ridge can be dived in almost any current and has plenty to keep you occupied for several dives. |
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Distance from Phuket |
75nm or 150km. About 12nm north of Island #9 in the Similans. |
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Visibility: |
Usually great, from 15 to 40m |
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What to look for:
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Hard corals are sparse, but pretty. Soft corals are especially pretty as they are wildly-colored. When the current is strong, the soft corals are full and bulbous. Sea fans are less common than they used to be, but still very pretty and healthy and multicolored. Fish life is abundant, with schools of jacks and snappers charging through clouds of glassfish that hover around large fan corals and barrel sponges. This is a favorite manta spot on ridge and in the bay. On deeper dives, rays and leopard sharks are seen. Sometimes nurse sharks on the northern bommies. If swell running, water cascades through an opening from the other side of the ridge, creating large clouds of bubbles that come surging down to greet you during your safety stop. | ||
At a Glance: Koh Tachai • Thailand • Liveaboard Destination • (More >>>) |
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Reef type: |
An underwater ridge runs along at 18-23m, with a southern and northern pinnacle. Most dive boats drop at the southern or biggest pinnacle. If the current is with you, you can swim along the ridge, but it's hard to find a shallow spot to do your safety stop. |
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Distance from Phuket |
95nm or 190km. About 20nm north-northwest of Koh Bon. |
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Visibility: |
Variable, from 5 to 30m. |
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What to look for:
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Can be fantastic or disappointing. Not to everyone's liking depending on what you see and how the current is. Either you love it or you hate it. Excellent growths of sea fans, whip corals, barrel sponges and other filter feeders, particularly in deeper areas. This is also a good area for leopard sharks and stingrays, as well as trumpetfish. Batfish will swim above the rock under the boat. Schooling fish are common, including dense mobs of snapper and chevron barracuda. On the main boulder where most people end up, not much coral. Manta cleaning station at certain times. Good deep dive if current is not too strong, you swim well, and your guide knows the site. |
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At a Glance: Richelieu Rock • Thailand • Liveaboard Destination • (More >>>) |
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Reef type: |
A series of pinnacles and peaks, starting at 40+m, ending just below the surface. One of the best dives in Thailand. |
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Distance from Phuket |
130nm or 260km. 9nm east of the Surin Islands. |
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Visibility: |
Extremely variable , from 2 to 40m! Visibility depends on tides and runoff from shore. It's closer to freshwater rivers than the Similan Islands, thus the water clarity is not as consistent. But here it's not about the vis, it's about the marine life. |
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What to look for:
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Home for porcelain crabs, harlequin shrimp, other bizarre shrimp and at least four different varieties of clownfish. Tigertail seahorses are seen commonly. Nudibranchs numerous. Scorpian fish, snappers, and a number of eel species including giant, white-mouth, fimbriated, snowflake, bar-tail and zebra morays. Lionfish everywhere, often "schooling". Excellent coral, dense colonies of sea anemones in shades of green, beige and brilliant purple cover many of the shallower rock surfaces, soft corals come in many shades of red, purple and blue. Octopus and cuttlefish, the latter of which are often seen mating and laying eggs among the rocky ledges. Whale sharks, manta rays, guitar sharks, soft corals in a rainbow of colors, schooling pelagic fish. Everything is possible here. This dive is like a box of chocolates; you never know what you're going to get. |
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At a Glance: Mu Koh Surin • Thailand • Liveaboard Destination • (More >>>) |
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Reef type: |
Rocks and boulders, sea fans, staghorn coral |
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Distance from Phuket |
60nm or 110km north of Mu Koh Similan National Park. 120nm or 215km north of Phuket. |
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Visibility: |
Variable , from 2 to 15m! Visibility depends on tides and runoff from shore. The islands get more rain than the Similans due to their proximity to shore. The islands are heavily forested so more vegetation washes into the water. |
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What to look for:
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Surin is not as popular for diving as other places, but it's a popular spot for people to visit the Moken or often called "Sea Gypsies" or chao lay in Thai (considered by some to be derogatory). Some divers very much enjoy the Surin Islands and there certainly is a big area to explore, including some pinnacles or piles of boulders completely submerged. There are also fast drift dives between Surin Nua and Surin Tai (north and south islands). Often the visibility is poor and there is a definite lack of fish around the islands. However, probably the main reason that people do not dive these islands more often is probably due to lack of time. Most of the dive trips do become a little rushed since the boats are trying to cover a lot of area in four or five days; other more interesting areas get more attention from the dive staff. You may dive here if it's windy and Richelieu Rock gets blown out. Or, if you do a longer northern-only trip, and if the divemaster has a favorite "secret" dive or two, then you may spend some time here. Turtle Ledges and Swift Passage are two of the more famous spots. Surin has several beautiful small coves for anchoring and the topography is similar to many of the islands in Mergui in Myanmar. In fact, all of those islands you see from Surin to the north are in fact in Mergui. |
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At a Glance: Three Islets or Shark Cave Reef, Mergui Archipelago, Myanmar (More >>>) |
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Reef type: |
Walls, canyons, pinnacles and sandy areas. |
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Distance from Kawthaung |
50nm or 90km |
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Visibility: |
Variable, 5 to 30m |
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What to look for:
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Good hard and soft corals, seawhips, sponges, crinoids, lyre coral, anemones, everything. A bit like Richelieu Rock, but in so many ways, so much better. The area is so big, it can be dived for several days. There are several dive sites here, some breaking the surface, some underwater. Nearly every square meter is riddled with crevices, nooks and crannies, providing shelter and holdfasts for an enormous volume of fish and invertebrate life. Schools of anchovies and fusiliers dash about avoiding the jacks and bonitos that harass them. In the sand, tube anemones, burrowing sea cucumbers, and varieties of sea stars, and large brown sea anemones serving as hosts for eggshell shrimp, as well as Sebae clownfish. On the reef, hawkfish, gorgonian crabs, basket stars (rarely seen in Thailand), jewel-box urchins, cuttlefish, squid, and cowries. Finally, to marble rays, false and true stonefish, flatheads, Schultz’s pipefish, badger clingfish, tiger-tail sea horses and numerous species of morays. This is also one of the better places to see exotic creatures like harlequin shrimp and harlequin ghost pipefish. Wow. Finally, there is a canyon to the west of the main island which sometimes harbors gray reef sharks, and often you'll find tawny nurse sharks in one of the small caves. | ||
At a Glance: North Twin Island, Mergui Archipelago, Myanmar (More >>>) |
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Reef type: |
North Twin Island and North Twin Plateau are the best sites. They feature huge rocks like the Similan Islands with some swimthroughs and white sand areas. |
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Distance from Kawthaung |
65nm or 120km |
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Visibility: |
Usually great , 20 to 35m |
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What to look for:
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Leopard and white-tip reef sharks inhabit the reef’s outer perimeter, usually in the sandy areas. If the currents are reasonable, swimming deeper will put you in a thick forest of sea fans on the north side. This site tends to attract a wide range of mid-water predators, including rainbow runners, bonito, queenfish, and lots of pickhandle and great barracudas and schooling triggerfish. Soft corals are pretty like they are in Similan. They are visually interesting dive sites, stunning with their rocky boulders and weird topography. | ||
At a Glance: Black Rock, Mergui Archipelago, Myanmar (More >>>) |
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Reef type: |
One huge narrow rock. Some ridges and rocky areas underwater. For the most part smooth. Sandy areas deeper. |
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Distance from Kawthaung |
100nm or 190km |
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Visibility: |
Usually great , 20 to 40m |
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What to look for:
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One of the deepest dive sites we have in Myanmar, the water depth around the rock gets to 60m very fast on all four sides. Dense mosaic of small soft corals, orange cup coral and feather stars. Colonies of small, tiger-striped anemones cling to fan corals and gorgonian skeletons; these are seldom seen outside of the Mergui Archipelago. Reef fish are also abundant, especially black-spotted puffers, scorpionfish, spotted hawkfish and blue-ring angelfish and schooling fish like pinjalo snapper and jacks. Really huge giant morays are common as are the jeweled, zebra, fimbriated and white-eyed. It is a good place for sharks and rays, but they are usually very deep, beyond the limits the average diver is trained for. Sometimes you'll see them in the distant blue, but they rarely come close to a diver unless you're below 35m. This is one of the better places to see manta rays. If they are around, they are everywhere as they circle the rock, dancing about. |
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At a Glance: Fan Forest Pinnacle, Mergui Archipelago, Myanmar (More >>>) |
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Reef type: |
Pinnacle starting at 5-meters. Canyons, sandy ledges, small walls; visually stunning. |
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Distance from Kawthaung |
45nm or 85km. Five miles (8km) north of Western Rocky. |
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Visibility: |
Usually good, 15 to 30m |
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What to look for:
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The most striking natural feature here is a tremendous number of huge, undamaged orange fan corals, mostly below 30m. There are rows and rows of them. Blue-ring angelfish, lionfish and coral trout are among the most common reef fish, in addition to mid-water species like jacks, barracudas and batfish. Leopard sharks are very common here, and almost the only place you see them in Mergui for some reason. They lie in the sand below the main rock, usually in the canyons and are surrounded by huge sea fans. It's quite spectacular. Some people don't love this dive as the currents can be stronger, but if you like currents, you'll love this dive. | ||
At a Glance: Western Rocky Islands, Mergui Archipelago, Myanmar (More >>>) |
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Reef type: |
Walls, canyons, a cave, and pinnacles, as well as sandy areas. There are many dives, a boat can easily spend two-days here. The topography is stunning and if you catch it on a day of great visibility, it's spectacular. |
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Distance from Kawthaung |
40nm or 75km southwest |
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Visibility: |
Variable, 5 to 30m |
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What to look for:
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Huge fields of orange fan corals, starting at about 30m and continuing to 39m and deeper. A large tunnel running completely through the island, in addition to several smaller caverns and a huge archway. The cavern has species of crabs and shrimp, murex and cowry shells, bigeye snapper and robust fusiliers, along with spiny lobsters. Sometimes tawny nurse sharks lie on the cavern floor. They eat the lobsters so don't take them! Reef fish include blue-ring angelfish, red emperor snapper, red-bar anthias and many varieties of moray eels. Invertebrates include nudibranchs, shellfish, feather stars, anemones and hermit crabs. Even rarities like clawed reef lobsters, harlequin shrimp and frogfish are seen. | ||
At a Glance: The Burma Banks, Mergui Archipelago, Myanmar (More >>>) |
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Reef type: |
Deep water seamounts, sand, coral and rock, shallowest area 15 meters (50ft) |
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Distance from Kawthaung |
100nm or 180km west southwest |
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Visibility: |
Variable, 5 to 30m |
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What to look for:
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The Burma Banks are a series of large underwater flat-topped sea-mounts that lie approximately 180 kilometers (100 nautical miles) northwest of the Similan Islands. The banks' surrounding water is over 350 meters deep and large areas rise to within the depth limits of recreational scuba diving. The name derives from the fact that this 1,500 square kilometer area lies within the exclusive economic zone of Burma. The banks offer some exciting, stimulating diving, but since this is true open-ocean diving, they certainly are not for everyone. These mountains rise very gradually from the depths and are covered with hard coral growth and large patches of sand. Although the huge plate corals (some of these 'plates' could seat all the knights of the round table easily) are in many areas fantastic, that is not the reason for traveling so far out to sea. The reason is for different types of environments not found in Thailand or in the Mergui Archipelago proper. |
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At a Glance: Narcondam Island, Andaman Islands |
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Reef type: |
Walls, canyons, pinnacles and sandy areas. Extinct Volcano, most remote island in the Andaman Sea |
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Distance from Port Blair |
150nm or 270km |
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Visibility: |
Excellent, 20 to 50m |
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What to look for:
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The most fantastic spot in the Andaman Sea is an extinct volcano. Walls drop to over 700 meters here as well—just off the shoreline—but the difference between this volcano and Barren Island is that here everything is alive and healthy. This is truly a diver’s paradise. Imagine four-meter tall barrel sponges. Sea fans are twice as large as they are in the Similan Islands. Monstrous dog-toothed tuna—one animal we saw was almost three meters long—cruise the walls and the shallower reef tops. The best part of our first trip to the area was the herds of mobula and manta rays that visited us on every dive—both in shallow and deep water. In four days we saw at least 50 of these rays and our first afternoon there we spent snorkeling with a group of 20 animals while they fed on the surface. Mantas and mobula are everywhere you go, even in shallow water right up to the beaches. No one knows why there are so many here, but the local soldiers who were stationed at the island said that they stay all year-round. | ||
At a Glance: Barren Island, Andaman Islands |
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Reef type: |
Active volcano. Vertical walls, ridges, black sand slopes |
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Distance from Port Blair |
65nm or 120km |
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Visibility: |
Usually great , 20 to 35m |
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What to look for:
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Barren Island is a volcanic island, and a very active one at that, as it erupts on a regular basis. The eruptions cover almost everything underwater and above with thick layers of black sand, creating an unusual landscape to explore. The southern side of the island has a deep wall down to over 700 meters of depth, and this drop-off is almost vertical. The northern side of the island slopes more gently, but to equally great depths. Although the layers of volcanic sand and lava killed most of the coral, dogtooth tunas, unbelievably large great barracuda, and sharks swim along its black walls. About the only life growing on the walls are white hydroids, which stings a bit when touched. Hammerhead sharks cruise through here, as well as very large silvertip sharks, gray reef sharks, and white tip reef sharks. Mostly the sharks are seen on very deep dives of over 50m or 200ft, well beyond the abilities of most recreational divers. On the gentle slope of the northern area, you can still see enormous sea fans which were half-buried by black volcanic sand but still alive and thriving. The contrast between the orange sea fans and the black sand is dramatic and something you don’t see often. It is also very interesting to swim over huge areas of sand surrounded by pitch-black vertical walls. It’s almost as if you’re swimming over a huge black sand beach. | ||
At a Glance: Minerva Ledge, Ritchie's Archipelago, Andaman Islands |
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Reef type: |
One huge narrow rock. Some ridges and rocky areas underwater. For the most part smooth. Sandy areas deeper. |
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Distance from Port Blair |
100nm or 190km. |
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Visibility: |
Usually great , 20 to 40m |
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What to look for:
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The dive area is one of the easiest to access as it lies close to Havelock Island. At first it doesn't seem much of a dive, as the coral is shallow and sparse and most of the small hill which rises up from the depths, is just sand. However, the fish life makes it very interesting. When we first explored the area, we went deeper to see the “big stuff” but soon realized that just sitting in one spot was the best way to dive here. We sat for over one-hour at about eight-meters and just watched the fish circle. We had a little wind-up toy of a white tip reef shark, just under 60 centimeters long, who would swim up to our masks, and then away for a few minutes, and back to us again. The fish overcame their shyness very quickly and soon we were surrounded by thousands of them, of all sizes and species. This is also one of the best snorkeling sites in the Andamans, although you must swim the whole time as there is no bottom to stand on. |
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At a Glance: Ritchie's Archipelago, Havelock, Andaman Islands |
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Reef type: |
Shallow Coral Gardens, narrow channels with mangroves, a wreck, sloping walls |
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Distance from Port Blair |
30nm or 55km north |
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Visibility: |
Usually good, 15 to 30m |
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What to look for:
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The dive schools in the Andamans are almost all located in the Ritchies Archipelago and in particular, Havelock Island. There are now at least five dive centers here, but working and living in the Andamans is difficult and the bureaucracy unimaginable, so don't except this information to be current when you read it. The dive centers have found a lot of good dive sites in the area, but the offshore sites that they cannot reach are still the best in the Andamans. However, everything from diving in mangrove areas with clear water, pinnacles, sandy shoals, channels between islands, and even diving with swimming elephants is possible. For more information, please visit Dive India's website. They have a reputable dive center and have been there for some years. | ||
At a Glance: Invisible Bank (Flat Rock), Andaman Islands |
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Reef type: |
A big flat rock sticking out of the sea, surrounded by 8+ meters of water. Rocky canyons, not much coral. |
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Distance from Port Blair |
60nm or 108km east |
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Visibility: |
Good, 25 to 40m |
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What to look for:
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Although not one of the best sites in the Andamans, it is visited by virtually every dive boat as it’s on the way from Phuket to Port Blair where you must check in prior to exploring either north or south. On the chart, the dive site appears to be very large, but most of the area which lies in depths friendly to divers is sand. Flat Rock, which prominently protrudes from the water, is the only place to dive. The waters just around it are very shallow, but you can get out to a depth of 15 meters or so if you venture over the sand. Like most places in the Andaman Islands, the fish life is the attraction here. There are almost no corals, hard or soft. But, swim around the area in 10 meters of water or less, and you’re likely to run into almost every kind of tropical pelagic fish imaginable. Sharks, including great hammerheads are seen often. Huge bumphead parrotfish and Napoleon wrasse patrol the area and are not shy around divers. | ||
At a Glance: Passage Island, Andaman Islands |
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Reef type: |
Rocky pinnacle with fingers shooting off to the depths, ridges and shallow walls |
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Distance from Port Blair |
30nm or 55km due south |
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Visibility: |
Variable, 5 to 30m. Tides make a huge difference in visibility, better when current is running. |
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What to look for:
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Passage Island features an offshore pinnacle appropriately called by many, Fish Rock, where almost every kind of pelagic fish can be seen in great numbers. The currents here can be vicious, but the rewards are enormous. The diving is best when the current is running strong, as fish are feeding during this time. Thus, the best way to dive the rock is by jumping in up current and descend rapidly down to 20 meters or so. Then, grab onto a rock, hold on, and watch the show. Keep your eyes on the deeper blue water and the reef edge where the rock meets the sand, and often you'll see gray reef sharks attacking rainbow runners and dogtooth tuna. Large eagle rays patrol the plankton rich waters completely at ease in the strong currents. Groupers larger than most men cruise the reef unafraid of divers—mainly because they've never seen a diver before. Huge bumphead parrotfish go by in schools of 20 or more. Of course if you get tired of this, you can always look for small animals on the reef and the varieties are unbelievable. However, swimming along the reef when the current is running strong is extremely exhausting, so most divers are happy just to sit in one place. There are not a lot of other dive sites in the area, so during a trip you are likely to visit this site many times. It’s not a huge site, but there is certainly a lot to see, and a lot of action. |
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