Scale: 1:96. A plan showing the sheer lines, body plan and longitudinal half breadth of a submarine depot ship, probably Maidstone, a turbine propelled vessel of the same type as Medway (1928) which was to be built under the 1928-29 programme but was cancelled in 1929. The plan had been filed as Adamant (1940), but does not match the date, appearance or dimensions of that vessel.