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Posted: August 21, 2017 4:15 PM

World War II Wreckage of USS Indianapolis Found

IndianapolisWASHINGTON — A team of civilian researchers led by entrepreneur and philanthropist Paul G. Allen has announced they have found the wreck of the World War II cruiser USS Indianapolis (CA 35), which was lost July 30, 1945.

An Aug. 19 Naval History and Heritage Command release noted this is a significant discovery, considering the depth of the water in which the ship was lost — more than 18,000 feet. Around 800 of the ship’s 1,196 Sailors and Marines survived the sinking, but after four to five days in the water — suffering exposure, dehydration, drowning, and shark attacks — only 316 survived.

The wreck was located by the expedition crew of Research Vessel (R/V) Petrel, which is owned by Allen, 5,500 meters below the surface, resting on the floor of the North Pacific Ocean.

“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 in ending World War II is truly humbling,” Allen in the release. “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.”

Indianapolis was lost in the final days of World War II when it was torpedoed by a Japanese submarine in the early morning hours of July 30, 1945. The Indianapolis sank in 12 minutes, making it impossible to send a distress signal or deploy much of its life-saving equipment, the release said. Prior to the attack, the Indianapolis had just completed a secret mission delivering components of the atomic bomb used in Hiroshima that would ultimately help end the war in the Pacific.

“Even in the worst defeats and disasters there is valor and sacrifice that deserves to never be forgotten,” said Sam Cox, director of the Naval History and Heritage Command. “They can serve as inspiration to current and future Sailors enduring situations of mortal peril. There are also lessons learned, and in the case of the Indianapolis, lessons re-learned, that need to be preserved and passed on, so the same mistakes can be prevented, and lives saved.”

Others have searched for Indianapolis in the past. Among the elements that made this effort different was Allen’s recent acquisition and retrofit of the 250-foot R/V Petrel with state-of-the-art subsea equipment capable of diving to 6,000 meters (or three and a half miles).

“The Petrel and its capabilities, the technology it has and the research we’ve done, are the culmination years of dedication and hard work,” said Robert Kraft, director of subsea operations for Allen. “We’ve assembled and integrated this technology, assets and unique capability into operating platform, which is now one amongst very few on the planet.”

The other key factor in the discovery was information that surfaced in 2016 when Dr. Richard Hulver, historian with the Naval History and Heritage Command, conducted research that led to a new search area to the west of the original presumed position.

Hulver’s research identified a naval landing craft that had recorded a sighting of Indianapolis hours before it was torpedoed. Using that information, the research team developed a new position and estimated search, which was still a daunting 600 square miles of open ocean.

The 13-person expedition team on the R/V Petrel is in the process of surveying the full site and will conduct a live tour of the wreckage in the next few weeks.

Their work is compliant with U.S. law, respecting the sunken ship as a war grave and not disturbing the site. USS Indianapolis remains the property of the U.S. Navy and its location will remain confidential and restricted by the Navy. The crew of the R/V Petrel has collaborated with Navy authorities throughout its search operations and will continue to work on plans to honor the 22 crew members still alive today, as well as the families of all those who served on the highly decorated cruiser.

EdgeTech, a provider of high-resolution sonar-imaging systems and underwater technology, built the autonomous underwater vehicle (AUV) -based side-scan sonar system that played a key role in the recent discovery of the USS Indianapolis wreckage 5,500 meters deep in the Philippine Sea, the company announced in an Aug. 21 release.

The EdgeTech 2205 AUV-based sonar system is one of the many advanced underwater technology systems on-board the R/V Petrel. The system is integrated into a deep-water AUV and is used on the AUV to acoustically image large swathes of the seafloor as the AUV swims thousands of meters below the surface. The EdgeTech system is configured as a dual frequency 75 / 230 kHz side scan sonar and bathymetry providing the ability to image over 1,000 meters from each side of the AUV as it conducts its search patter in deep waters.  



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