Scale 1:48. Plan shows a plan view of the superstructure, the area above the flats and the area below the flat of a proposed 221ft Patrol and Minelaying submarine (not built). This plan bears the signature of Sir Stanley Vernon Goodall [Director of Naval Construction 1936-1944]. This submarine appears to have been a derivative of the S-class submarines, but there is no evidence to suggest this was built or even ordered. The plan is noted as Sheet Number 2.