Turtle Cavern is one of the highlights of Sipadan island thanks to its incredible geological formations and turtle skeletons.
About 18m deep is the entrance to Turtle Cave. The cave first goes down in a bell shaped descent tunnel and leads to the lower chamber. Following the left side of the cavern will bring you in front of a tunnel. This tunnel is connecting Turtle Cavern with Turtle Tomb a small cave system which contains many turtle skeletons. This is due to the great number of turtles that they simply enter the cave and are unable to find the exit .
This dive needs an experienced guide and special equipment.
Depth: 14-23 metres
Location: East of The Jetty.
| Dive site | Max depth | Level | Dive Type |
| Barracuda Point | 40m 131ft | AOW | Wall, Reef |
| Coral gardens | 23m 75ft | OW | Wall, Reef |
| Hanging Gardens | 40m 131ft | OW | Wall, Reef, Sharks |
| Lobster lairs | 40m 131ft | AOW | Wall, Reef, Big Fishes |
| North Point | 40m 131ft | AOW | Drift, Wall, Reef, Sharks |
| South Point | 40m 131ft | AOW | Wall, Reef |
| Staghorn Crest | 40m 131ft | AOW | Wall, Reef, Sharks |
| The Jetty | 40m 131ft | OW | Wall, Reef |
| Turtle Cavern | 23m 75ft | AOW | Cave, Reef |
| Turtle Patch | 12m 39ft | OW | Wall, Reef, Sharks |
| Turtle Tomb | 23m 75ft | DM | Cave |
| West Ridge | 40m 131ft | OW | Wall, Reef, Sharks |
| Whitetip Avenue | 40m 131ft | OW | Wall, Reef, Sharks |
| Midreef | 40m 131ft | AOW | Wall, Reef |
| The Drop Off | 40m 131ft | AOW | Wall, Reef |