Explorer departed from
Ushuaia, Argentina, on 11 November 2007 on a 19-day cruise called
Spirit of Shackleton run by Gap Adventures, intended to trace the route of the 20th-century explorer
Ernest Shackleton through the
Drake Passage (an area typically stormy with rough seas). After visiting the Falkland Islands and South Georgia, she hit an iceberg on 23 November 2007 in the
Bransfield Strait, close to
King George Island in the
Southern Ocean and near the
South Shetland Islands. The iceberg struck by
Explorer made a gash in the hull which allowed water to enter. The
Argentine Navy later said in a statement that it had observed "significant" damage. Some passengers on
Explorer reported a loud "bang" at the time of impact, although others reported that there had been no noticeable impact, or at least nothing more than the normal crunching of ice experienced when sailing through icy waters. One passenger reported sea water in their cabin at about 03:00
UTC. Some reports also indicated that the ship had drifted into an iceberg on
Explorer starboard side while the crew was assessing damage caused by the original impact, also to the starboard side of the ship. A
mayday call was put out by the ship at 04:24 UTC, and rescue operations were quickly coordinated by the DPA Peter Burman in Sweden who made contact with the
Prefectura Naval Argentina (the Argentinian equivalent of a coastguard) and the Chilean Navy Center for
Search and Rescue. Chile dispatched the
icebreaker as well as nearby commercial ships, including the MN
Ushuaia, the , and the Norwegian
Coastal Express ship which was operating as a passenger cruise ship at the time. By 07:30 UTC all 91 passengers, nine guides and 54 crew, from over 14 countries, had taken to the
Explorer lifeboats. They drifted for five hours until they were picked up by the Norwegian ship MS
Nordnorge, which arrived on scene at approximately 10:00 UTC. All of those rescued by
Nordnorge were taken to the Chilean
Frei Montalva Station on King George Island, from where they were subsequently airlifted by
C-130 Hercules
transport aircraft of the
Chilean Air Force to
Punta Arenas, Chile, Her wreck lies at .
Explorer was designed, like most ships, with compartments which could be sealed off by watertight doors. The ship would not sink if holed and one compartment flooded, but was not safe if more compartments were flooded, either by a gash spanning compartments or imperfect sealing between compartments. Gap Adventures reported that there was a crack in addition to the hole, but it is not clear if it spanned compartments. In an article published on 8 December 2007, Jim Barnes, the executive director of the
Antarctic and Southern Ocean Coalition said that
Explorer was "perfect for ice navigation", and stated that the explanation of the sinking "doesn't add up" and that "essential pieces of the story are missing". Sander Calisal, professor emeritus of naval architecture at the
University of British Columbia, added that
Explorer's ice-reinforced hull ought to have withstood accidental contact with submerged ice. ==Investigation==