Sharks can go anywhere they damn well please. Case in point: Some of them like to swim around in active volcanoes.
In this National Geographic video, a team of scientists drop a deep-sea camera down into Kavachi, the main peak of a submarine volcano in the Solomon Islands. The volcano, which is often erupting with lava and ash, was unusually quiet, so they were able investigate the hostile depths without incident.
Instead of finding a barren landscape inside the crater thanks to the water's high temperature and acidity, they found stingrays, snapper, and unexpectedly, hammerheads and silky sharks.