Similan Dive Sites
Koh Doc Mai literally means "flower island". There are different stories of how the place got its name - some say it is because the island was once full of blossoming flowers, and others claim its name comes from the underwater beauty around its shores.
The marine life here is truly diverse and is similar to that of Shark Fin Reef. Sharks sometimes can be spotted around the sand bottom around the boulders. You can also see napoleon wrasse, humphead parrotfish and turtles as well. Big groupers, snappers, angelfish, unicorn fish, boxfish and pufferfish can all be found dwelling around the boulder cliff.
Some smaller creatures such as pipefish, fire gobies, boxer shrimp, and dancing shrimp can be seen inside cracks and underneath rocky clusters. Lastly, you can sometimes see big pelagics such as manta rays cruising around the vicinity.
This dive site is suitable for experienced divers because of the depth, 12 to 18 meters at the top of the boulders, and also because of the strong current. In some cases to avoid decompression dives, divers may need to swim against the current in mid-water between the rocks because the depth to the sand bottom is sometimes too deep.To avoid this situation divers should swim close to or behind rocks to avoid strong current.
You may consider mid-water diving against the strong current a good exercise, but this would be more of a dive for survival than for recreational purposes! Overall Boulder City is great for a first deep dive in the morning.