In this photo provided by the Chile's Air Force, passengers from the Liberian-flagged Explorer cruise ship are transported on lifeboats after their ship, unseen, hit an object, possibly a large ice chunk.
This image made from a webcam on board the MS Nordnorge shows the the Liberian-flagged Explorer listing in Antarctic waters, Nov. 23, 2007.
The passenger ship MV Explorer is seen in this undated file photo made available from Museum of Uusikaupunki, Finland.
The ship began sinking after it hit an object and began taking on water through a hole in the hull, naval and coast guard officials said. No injuries were reported.