German forces occupied Norway in 1940 and this resulted in many refugees fleeing west to Shetland.
A secret base was set up at Lunna on Shetland and during the winter the same fishing cutters that brought the refugees, took agents, wireless sets and arms to Norway to support the resistance.
At one point, losses were so great that they nearly gave up. It was only through sheer determination that the Shetland Bus continued.
The operation was of great psychological importance to the Norwegian people and at the end of the war, there were 60 illegal radio stations transmitting from Norway, most of which had been put there by the Bus.
Strategically, the Germans were forced to use lots of men and resources to defend the western coast of Norway. The SB missions were one of the reasons that the Germans thought the allied invasion would come via Norway rather than Normandy and they even set up a chain of gun fortresses to protect it.
The Norwegian people have never forgotten the bravery of those involved with the Bus and there is a memorial in Alesund Harbour to them.