Why diving by night at Cocos Island could be a horrible idea...

Imagine to dive in the dark sea at night close to the reef of Cocos Island, Costa Rica, then suddenly you use the flash of the camera just to have a quick look of the world around you.... that's what you'll see:



Hundreds of Whitetip Reef Sharks hunting.
It could be a relief knowing that they are not aggressive toward humans (normally) and will (generally) swim away if disturbed, although it may bite if harassed. However I would not feel comfortable in the shoes (flippers) of this photographer..