Sipadan is famous for its populations of green and hawksbill turtles. This cavern lying in around 20 meters of water was rumored once to be a catacomb where the local turtles came to find their final resting place. It was later discovered that the turtles simply got lost in the cavern system at night and drowned. Inside the labyrinth of interconnecting caverns are the shells and bones of those less fortunate turtles that failed to find an exit. Divers are advised to take extreme caution in the caves as visibility can easily and quickly be reduced to zero if silt is disturbed. Note that only a couple of dive resorts can bring certified cave divers deep inside the cave including Seaventures and also Sipadan-Mabul Resort.