The entrance from underwater cave is a place where sand tiger sharks like to gather. At that time there were more than 30 of them. The sharks look fearsome but are quite placid. I only feared not to spook them. Having flattened myself against the cave wall, I tried to breathe shallowly to avoid any noise and let the sharks go as close as possible. Finally, after long waiting in cold water, one large sand tiger appeared out of the gloom, followed by a school of eastern pomfred fish.