Rare images of the Titanic, at peace on the ocean floor, were released this week. Some of the footage, shot during the 1986 expedition to the world’s most famous shipwreck, has never been seen before by the public. The expedition’s leader, Robert Ballard, described what he saw then as “haunting” and “very powerful.” The Woods Hole Oceanographic Institution made the footage available to mark the 25th anniversary of the release of James Cameron’s "Titanic" motion picture.