Divers slide into the chilly waters of the Canadian Arctic’s Terror Bay. There, they descend to the astonishingly well-preserved shipwreck of HMS Terror. Now, it was one of two ships that departed from England and mysteriously disappeared on the ill-fated Franklin Expedition of 1845. Next, the divers insert a small remotely controlled vehicle (ROV) with a camera through an open hatch. And now they have a clear view of the ship’s interior. Startlingly, they’re the first to see it in over 170 years.