On March 9, a search expedition made a notable discovery: the 144-foot (44-meter) wooden ship known as the Endurance, that once carried explorer Ernest Shackleton and his crew to Antarctica, had been found 3,000 m (10,000 ft) deep in the Weddell Sea, 106 years after it sank in ice-crushing conditions. About 320 kilometers (200 miles) away, a different kind of search expedition was taking place in the Weddell Sea. A research team led by Greenpeace was documenting vulnerable marine ecosystems in this part of the Southern Ocean, capturing images of corals, sponges and other organisms that had nev…