The sea holds many mysteries, but few detectives were as dogged as the Abele brothers who search a lifetime for their father’s submarine which went missing during World War Two. In 2006 they began crisscrossing the Bering Sea, probing its depths with sonar. The brothers caught a break when a Japanese historian found a lost account of the Grunion ’s last battle, which mentioned a confrontation between a cargo ship and the sub. The freighter’s crew spotted two torpedoes bubbling toward them, the first of which missed; but the second exploded and stopped the engine. Terrified, the Japanese seamen turned a deck gun on the sub, firing eighty-four times as it began to surface. 

“There was a dull ‘thud’ noise and a little spout. Presumably oil, we don’t know,” John said. Their dad’s sub slid into history’s shadows, and seventy men were never heard from again. Until now.