Scale 1:48. Plan shows the plan view of the flats, as fitted for the T class submarines Turpin (1944) & Thermopylae (1945). A separate partial plan of the Control Room at Frames 69-98 and another at Frames 40-44, specifically for Thermopylae, is also included on the plan. A Chatham Dockyard Manager of Constructive Department stamp, bearing the signature of G. Hudson, who has signed on behalf of the Manager of Constructive Department, is printed on the drawing.