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An image shot from a remotely operated vehicle shows the bottom of an anchor clearly marked “U.S. Navy” and “Norfolk Navy Yard.” Photo courtesy of Paul G. Allen.

With the help of a remotely-operated vehicle and new historical information, Microsoft co-founder Paul Allen and a team of researchers have discovered a lost U.S. Navy cruiser 5,500 meters below the surface of the Philippine Sea.

On Friday Allen’s crew located the USS Indianapolis, one of the most historic ships from World War II. The 9,800 ton heavy cruiser was the flagship of the Fifth Fleet and completed a secret mission to deliver parts of the first atomic bomb used in warfare. It was torpedoed by a Japanese submarine on July 30, 1945 while en route from Guam to Leyte. Only 316 of the 1,196 sailors and Marines survived; 22 still live today.

The USS Indianapolis in 1937. U.S. Navy Photo Courtesy of Naval History and Heritage Command.

After several expeditions to try and locate the Indianapolis, Allen’s 16-person team was successful thanks to two important factors. The first was a 250-foot research vessel that Allen bought last year and retrofitted with state-of-the-art subsea equipment, including a remote-controlled vehicle with attached HD cameras capable of diving 6,000 meters. The second was a discovery last year by historian Dr. Richard Hulver, who found a new potential search area.

See more photos of the wreckage here:

“To be able to honor the brave men of the USS Indianapolis and their families through the discovery of a ship that played such a significant role during World War II is truly humbling,” Allen said in a statement. “As Americans, we all owe a debt of gratitude to the crew for their courage, persistence and sacrifice in the face of horrendous circumstances. While our search for the rest of the wreckage will continue, I hope everyone connected to this historic ship will feel some measure of closure at this discovery so long in coming.”

Paul Allen speaks at the University of Washington. (GeekWire Photo / Todd Bishop)

Allen’s crew will live stream a video tour of the wreckage in the coming weeks, similar to what they did for the Japanese battleship Musashi, which Allen helped discover in 2015. The 64-year-old also led a mission to find the Italian World War II destroyer Artigliere this past March.

Here are photos of the vessel and remote-controlled vehicle; photos via Vulcan (Allen’s investment arm):

Here’s how the subsea survey process works, via Vulcan:

  • The AUV deployed with pre-programed search parameters for up to 20 hrs. This search / survey technique commonly referred to as mowing the lawn.
  • Once a search grid is complete, the AUV returns to a pre-programmed location where it is retrieved and the team downloads its data.
  • While reviewing the data, the team looks for anomalies that indicate man-made objects or features that appear abstract to the surrounding geology.
  • Then the targets or features of interest are subsequently explored with the ROV for positive identification. The ROV descends and ascends at 35 meters per minute, depending on depth; it can take up to three hours for the ROV to reach its target.
  • The AUV data provides precise location information that allows the ROV to pinpoint previously detected targets. In Petrel’s survey suite, the team reviews the video feed to determine what the AUV scan detected.
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