In 2005, divers locate a wreck in the Gulf of Thailand that turns out to be the USS Lagarto, an American submarine sunk during World War Two with all 86 crew aboard, entombed 8,000 miles from Two Rivers, Wisconsin, the town where she was built. The film follows the investigation into her final battle, drawing on Japanese and American naval records, wreck footage, and interviews with historians and surviving family members who spent sixty years without a grave to visit. It reconstructs the sub's last patrol and the depth-charge attack that sent her down, and asks why no one aboard managed to escape a stricken submarine that, in theory, gave her crew a chance to do so. The families left behind carried decades of unanswered questions before the wreck's discovery gave them a location, if not answers, and the documentary treats their wait as seriously as the naval history. It is a straightforward piece of archival and interview-based nonfiction, built for viewers who want the full account of one submarine's disappearance.