How the New England Aquarium Averted a Sea Turtle Apocalypse The Kemp’s Ridley is the world’s most endangered sea turtle. Last fall, 665 of them suddenly washed up on Cape Cod. Nobody is sure why. The effort to save them was nothing short of miraculous. But will it happen again? By Chris Sweeney | October 19, 2015, 1:55 p.m.