American U-576 attacked convoy off Key West in July 14 , 1942 . `` As we learn more about the underwater battlefield , Bluefields and U-576 will provide additional insight into a relatively little-known chapter in American history . '' U-boat sank tanker Bluefields , but was sunk by Kapitanleutnant Hans-Dieter Heinicke planes , ship . Wrecks rest 30 miles apart on bottom of Atlantic .
American U-576 attacked convoy off Key West in July 14 , 1942 . U-boat sank tanker Bluefields , but was sunk by Kapitanleutnant Hans-Dieter Heinicke planes , ship . Wrecks rest 30 miles apart on bottom of Atlantic .