A team piloting Microsoft co-founder Paul Allen’s research vessel, the R/V Petrel, has found the wreck of the USS Indianapolis at the bottom of the Philippine Sea. The USS Indianapolis played an important role in WWII history, including the delivery of parts for the atomic bombs that would eventually drop on Japan. Its wreck has remained elusive despite multiple expeditions over the past 72 years. The Petrel relied on an autonomous underwater vehicle that could dive roughly 18,000 feet below the water and hunt about 600 square miles using sonar and bathymetry.