National Geographic photographer Paul Nicklen was in Antarctica to photograph leopard seals. A leopard seal can weight up to 1300 lbs, and are one of the top predators in the Arctic, (I am not sure if I would jump into that water). Paul describes what it was like to come face to face with a Leopard seal.

If you like that you might also like a TED talk that Paul gave last year where he talked about what it was like to take photographs in the Antarctic, and the impact of disappearing ice.