Brent Stephenson / A cruise ship heads back up the Beagle Channel towards Ushuaia at the end of an Antarctic cruise. Beagle Channel, Tierra del Fuego Archipelago, South America, December.

Tui De Roy / Tourists cruising Beagle Channel beneath Romanche Glacier, Patagonia, Chile

Ashley Cooper / Sunrise over Antarctic expedition ships in the harbour of Ushuaia, Tierra del Fuego, Argentina. February 2014.

Ashley Cooper / Sunrise over the harbour of Ushuaia, Tierra del Fuego, Argentina. February 2014.

Ashley Cooper / Argentinian Naval vessels in the town of Ushuaia, Tierra del Fuego, Argentina. February 2014.

Ashley Cooper / Antarctic cruise boats moored in the town of Ushuaia, Tierra del Fuego, Argentina. February 2014.

Michael Pitts / Gregarious lobster krill (Munida gregaria) in defensive position. Beagle Channel. Argentina.

Michael Pitts / Gregarious lobster krill (Munida gregaria) juvenile. Beagle Channel. Argentina.

Tim Laman / View across the Beagle Channel from Tierra del Fuego, South America, February 2011.

David Tipling / Darwin's Rhea (Rhea pennata) Beagle Channel, Chile.

Enrique Lopez-Tapia / Boat moored in the Beagle Channel (named after visit of the HMS Beagle and Darwin) between Chilean and Argentinian areas of Tierre del Fuego

Enrique Lopez-Tapia / View from aboard boat navigating the Beagle Channel (named after visit of the HMS Beagle and Darwin) between Chilean and Argentinian areas of Tierre del Fuego