Susanne Lockhart and John Hocevar in Submersible in Antarctica

Dr Susanne Lockhart (l), from the California Academy of Sciences and John Hocevar (r), Greenpeace USA's Oceans Campaigns Director and submersible pilot prepare to dive off Half Moon Island in Antarctica.
The Greenpeace ship Arctic Sunrise has returned to the Antarctic Peninsula with scientists Susanne Lockhart and Rachel Downey for a series of dives with a submersible to explore the sea floor. Greenpeace is conducting scientific research and documenting the Antarctic’s unique wildlife, to strengthen the proposal to create the largest protected area on the planet, an Antarctic Ocean Sanctuary.