"The Asknia - US Device USED To Train British Submarine Crews. 16 and 17 December 1942, Blythe, the Asknia Training Device, Acquired From the Lease-lend Agreement, Is An Electro-hydraulic Machine Which Reproduces the Behaviour of a Submarine in Varying Conditions, and Is USED in the Training of Officers and Ratings." RN officers learning trimming on the Asknia training device.