The player may end the patrol early, but must meet conditions to get home safely.
How it works
The game ends after Turn 20 or when the boat is sunk. At the start of any turn the player may return to base, which requires no Searching or Detected tokens, surfacing, and surviving one last Aircraft Phase. Failing to surface by the end of Turn 20 loses the game.
To successfully return to base you must: Begin the turn with no Detected or Searching tokens in the Enemy Destroyer Area; Return the U-boat to the Surface, and Survive an Aircraft Phase one last time



