An extrovert crabeater seal.
A crabeater seal appears to make a gleeful repeated-jumping (porpoising) approach to our ship as we pass right to left. He's only about 15m away from the ship's hull! This was only one of 2-3 occurrences seeing seals porpoising in a 10 day trip and the only 'target of opportunity'.
Near Lallemand Fjord, Antarctic Peninsula.