Captain Fernando Romo (l) and 1st Mate Adrian Arauz Hernandez (r) look out for the A68, the world's largest iceberg pictured in the Southern Ocean between the South Orkney Islands and the South Shetland Islands, Antarctica. A68 calved from the edge of the Larsen C Ice Shelf in July 2017.

The Greenpeace ship Esperanza is on the final leg of the Protect the Oceans voyage from the Arctic to the Antarctic. The almost year-long voyage is one of Greenpeace’s biggest ever expeditions and highlights the many threats facing the oceans while campaigning for a Global Ocean Treaty covering all seas outside of national waters.