Tirpitz in Norway : X-craft midget submarines raid the fjords, Operation Source 1943 /Angus Konstam ; illustrated by Edouard A Groult, Adam Tooby.

"This thrilling new account explains the immense challenges of Operation Source, how it was planned and carried out, and how the last two surviving X-craft successfully laid their cargoes of time-fused Amatex on the seabed - and crippled Germany's most powerful battleship for good."