You can do both shark diving and cave diving in the Blue Hole near Ambergris Caye in Belize. About 100' feet down in the Blue Hole is a cave network that has never been completely explored, and to add to the excitement you frequently have to swim through Hammerhead Sharks to get to the cave.
The sharks, no problem but the Blue Hole at about 100’? A decompression dive on top of a cave dive? So how long do you decompress after exploring the cave?