Scale 1:48. A dyeline copy of a plan showing the pressure hull expansion for the a class submarines Aeneas (1945), Alaric (1946), Artemis (1946) and Artful (1947). The drawing was originally to be used for all A class submarines but this version has since been edited for submarines built by Scott's shipbuilding, Cammell Laird while those built by Vickers Armstrong have been crossed out. There are two very faded stamps in the top left corner of the plan.