Drawing not to scale. Plan shows No. 1 [forecastle] No. 2 [main], No. 3 [lower] and No. 4 [hold] decks, illustrating the incident board for the Type 15 anti submarine frigate Undaunted (1943).This panel would be on the wall and would light up if an incident (such as fire, flooding or a injury) was reported in a specific location on board. Undaunted was originally a U class destroyer but was converted into a Type 15 frigate between 1952 and 1954. A Portsmouth Dockyard manager of Constructive Department stamp, dated 29 April 1958 is printed on the plan.