 Josef Guenther Lettenmaier, who served on U 29 as "Maschinenquartiermeister", roughly equivalent to Machinist Mate 2nd Class, documented his experiences in the Austro-Hungarian Navy and aboard U 29 as historical fiction in "Rot-Weiss-Rot zur See", published by Tyrolia Verlag, Innsbruck, 1934.Lettenmaier's book is the only published record of the K.u.k.U-Waffe written by "other ranks".