All ocean-going attack submarines are here.
“This submarine type was the first to have a diesel engine instead of the petroleum-fired...Typ U 19
“The second class of German diesel-powered ocean-going attack submarines. All ships were built at...Typ U 23
“The fourth class of diesel-powered, ocean-going German fleet submarines. All units were...Typ U 31
“This class of diesel-powered, ocean-going German fleet submarines was originally intended for...Typ U 66
“A large ocean-going submarine pattern with the properties of an attack submarine and added...Typ UE I