A huge tabular iceberg and brash ice near the Antarctic Peninsula.

Open leads surrounded by multi-year ice floes in the Barents Sea between EdgeÏya (Edge Island) and Kong Karls Land in the Svalbard Archipelago, Norway.

Open leads surrounded by multi-year ice floes in the Barents Sea between EdgeÏya (Edge Island) and Kong Karls Land in the Svalbard Archipelago, Norway.

Open leads surrounded by multi-year ice floes in the Barents Sea between EdgeÏya (Edge Island) and Kong Karls Land in the Svalbard Archipelago, Norway.

The National Geographic Endeavour and its inflatable Zodiacs breaking through fast ice in and around the Antarctic Peninsula.

Huge icebergs and brash ice near Petermann Island on the west side of the Antarctic Peninsula.

Polar bear yawning (Ursus maritimus) on multi-year ice floes in the Barents Sea off the eastern coast of EdgeÏya (Edge Island) in the Svalbard Archipelago, Norway.

A lone Adelie penguin (Pygoscelis adeliae) hauled out on ice floes near Heroina Island in the Weddell Sea. Antarctica.

Curious polar bear (Ursus maritimus) on multi-year ice floes in the Barents Sea off the eastern coast of EdgeÏya (Edge Island) in the Svalbard Archipelago, Norway.

The National Geographic Endeavour pushing through brash ice and small icebergs in the Lemaire Channel near the Antarctic Peninsula.

The National Geographic Endeavour pushing through brash ice and small icebergs in the Lemaire Channel near the Antarctic Peninsula.

Icebergs and brash ice reflected in calm waters on the west side of the Antarctic peninsula, Antarctica.

Multi-year ice floes and brash ice near the Antarctic Peninsula.