Dont involve me in these infernal machines Davie - most unsporting things ever invented.
She si ideed the ex U5 of the type 205 single hull submarine, they were built for the shallow waters on the Baltic and although no longer used ( I think) by Germany Denmark also had two of them and called them the Tumleren class, 13 boats were built inc the danish jobs between 1962 and 1970 ( the Danish boats being the final two. most were scrapped bu a couple or maybe three are museum ships in Germany.
L 44 B 4.6 Draft 4.3 Mts ( presumedly a surfaced draft !!) disp 450 on the top and 500 tonnes submerged. max depth 100 mts
Machinery : Single screw Surfaced twim Mercedes-Benz V12 Diesels 600 BHP each, submeged a single 1,100 Kw motor
Armed with eight 533mm Torpedo tubes - reloads unknown
Use - Diesel electic Hunter-Killer