Bryan and Cherry Alexander / Icicles hanging from a ledge on an iceberg, Antarctica, October 2006.

Hiroya Minakuchi / Glacier on coastal mountain, Antarctic Peninsula, Antarctica

Hiroya Minakuchi / Iceberg, Antarctic Peninsula, Antarctica

Hiroya Minakuchi / Icebergs and coastal mountains, Antarctic Peninsula, Antarctica

Hiroya Minakuchi / Pack ice, Antarctic Peninsula, Antarctica

Bryan and Cherry Alexander / Icicle fronted caves in an iceberg, Antarctica, 2009.

Bryan and Cherry Alexander / Icicles hanging from the edge of an undercut iceberg by the shore of Snow Hill Island, Antarctica, October 2009.

Bryan and Cherry Alexander / Icicles hanging from a ledge on an iceberg, Antarctica, October 2006.

Bryan and Cherry Alexander / Detail of an iceberg crack against a blue sky. Antarctica, October 2006.

Bryan and Cherry Alexander / Detail of ice on the side of an iceberg showing holes in a softer layer of ice. Antarctica, October 2006.

Frederique Olivier / Icebergs on antarctic sea, Antarctica

Onne van der Wal / A natural archway weathered in an iceberg, Antarctic Peninsula.