In the murky waters of the Strait of Malacca, about 90 miles south of Phuket, Thailand, four divers discovered a World War II submarine that was scuttled 77 years ago, now teeming with marine life. The wreckage, believed to be the USS Grenadier, was located last October by divers Jean Luc Rivoire, Lance Horowitz, Benoit Laborie and Ben Reymenants, the team announced this month. Over the subsequent six months, the men — one of whom, Reymenants, assisted in the 2018 rescue of the boys’ soccer team that was trapped in a cave in northern Thailand — completed six carefully planned...