Darwin Island, Galapagos
A not so great shot, but the only one
I got of silky sharks.
After we had been on the surface quite a while, snorkelling with a whaleshark,
I happened to look down and saw one of these guys coming up to investigate.
When I looked again less than a minute later, there were at least five of
them below me. That was when I knew it was time to get out of the water ;^)