Commandos: Behind Enemy Lines Mission 7 - Chase of the Wolves

In the first of February, 1942, the Germans shift to a new cipher code for radio communications with the U-boats, the dreaded submarines which threaten the vital convoys that feed Britain. This will mean the loss of one of the best weapons against the enemy: the ability to decode German messages.
According to one of the last communications successfully deciphered, a group of U-boats is making an intermediate stop at the Norwegian port of Arendal. Your orders are to infiltrate the U-boat shelter and sabotage the submarines.