10,000 feet below the icy surface of antarctica s weddel sea, researchers and deep sea robots have discovered one of the 20th century s most famous ships. people said we d never be able to find this shipwreck. but they did. they persisted. reporter: this is the first image of explorer s ernest shackleton ship endurance since it was crushed by ice and sank 107 years ago. frozen in time, the three-masted wooden ship is largely preserved, its bolts shiny, even dinner plates, these white circles remain. i never dreamed that we d see the gold lettering of endurance with the polar star there on the stern. reporter: historian dan snow has been documenting the expedition that found it. why was this discovery so significant? it s the best-preserved shipwreck of the era of wooden sailing vessels that we have anywhere in the world. i takes us back to one of the greatest stories in history. reporter: in 1914, shackleton set sail for antarctica, attempting to be the
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