"The Endurance22 Expedition has located the wreck of Endurance, Sir Ernest Shackleton’s ship which has not been seen since it was crushed by the ice and sank in the Weddell Sea in 1915."

The Falklands Maritime Heritage Trust annnounces.

Clear video of the wreck (in what the leader of the expedition calls "a brilliant state of preservation"):

Here's the NYT article, "At the Bottom of an Icy Sea, One of History’s Great Wrecks Is Found/Explorers and researchers, battling freezing temperatures, have located Endurance, Ernest Shackleton’s ship that sank in the Antarctic in 1915." 

Under the terms of the Antarctic Treaty, the six-decade-old pact intended to protect the region, the wreck is considered a historical monument. The submersibles did not touch it; the images and scans will be used as the basis for educational materials and museum exhibits...

Shackleton left England aboard Endurance with a crew of 27 in 1914, bound for a bay on the Weddell Sea that was meant to be the starting point for an attempt by him and a small party to be the first to cross Antarctica....

And let me recommend the excellent New Yorker article, "The White Darkness/A solitary journey across Antarctica" by David Grann (available at Amazon in book form). Excerpt: 

He had studied with devotion the decision-making of Shackleton, whose ability to escape mortal danger was legendary, and who had famously saved the life of his entire crew when an expedition went awry. Whenever Worsley faced a perilous situation—and he was now in more peril than he’d ever been—he asked himself one question: What would Shacks do?