Week 187B - The End of Hydra? - WW2 - April 1, 1943 World War Two : Season 5 Episode 15

The phantom submarine that has been savaging both Japanese and Allied shipping in the South Pacific is tracked to Hydra Island, Baron von Strucker's base. The fighting for it is a tough hand-to-hand combat, as Japanese and American soldiers ally with each other in the face of a common enemy.