The Shetland Bus (Norwegian Bokmål: Shetlandsbussene, def. pl.) was the nickname of a clandestine special operations group that made a permanent link between Mainland Shetland in Scotland and German-occupied Norway from 1941 until the surrender of Nazi Germany on 8 May 1945. This link transferred agents in and out of Norway and provided them with weapons, radios and other supplies. From mid-1942, the group's official name was the Norwegian Naval Independent Unit (NNIU). In October 1943, it became an official part of the Royal Norwegian Navy and was renamed the Royal Norwegian Naval Special Unit (RNNSU). The unit was operated initially by a large number of small fishing boats and later augmented by three fast and well-armed submarine chasers – Vigra, Hessa and Hitra.[1]
Crossings were mostly made during the winter under the cover of darkness. This meant the crews and passengers had to endure very heavy North Sea conditions, with no lights and constant risk of discovery by German aircraft or patrol boats. There was also the possibility of being captured whilst carrying out the mission on the Norwegian coast.
Early on it was decided that camouflage was the best defence, and the boats were disguised as working fishing boats and the crew as fishermen. The fishing boats were armed with light machine guns concealed inside oil drums placed on deck. The operation was under constant threat from German forces, and several missions went awry, of which the Telavåg tragedy in spring 1942 was a prime example. Several fishing boats were lost during the early operations, but after receiving the three submarine chasers there were no more losses.[2]