By the time the submersible settled onto the ocean floor, it was pitch black outside. At a depth of 12,500 feet in the North Atlantic, sunlight could not penetrate. Only the gentle glow of the vessel’s lights illuminated what lay ahead. And then, out of the darkness, it appeared. There it was, Mark Lach says, pausing as if he is still processing the moment years later. “The bow. Just like the photographs. Except this time, it was real. Towering. Still. Majestic.