IJN I-169 – The WWII Sub That Tried to Escape Under Fire Found After 28 Years

IJN I-169 rests in Truk Lagoon at roughly 100–130 feet, an intact WWII submarine that didn’t die in battle—but in a quiet accident weeks after Operation Hailstone. On April 4, 1944, an air-raid alert triggered a routine crash dive; the boat reached depth, then its engines/ventilation systems failed and it couldn’t surface. With no attack damage and hatches sealed for diving operations, the crew was trapped as carbon dioxide slowly built to lethal levels. Divers later found the wreck largely unscarred by combat, with equipment in place and the remains of about 70 men at duty stations, suggesting desperate attempts to restart systems. Today it’s both an artificial reef and a protected war grave—an example of how submarines often died not heroically, but mechanically, in the dark.