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1943, Stratosphere Chamber, On long term display

This inert test specimen of the full size ‘Upkeep’ mine was one of a number filled with concrete and dropped off the North Kent Coast near Reculver shortly before the Dams raid. Eagerly witnessed by Barnes Wallis, ‘Mutt’ Summers, W/Cdr. Guy Gibson and others, these final trials flown by ‘Shorty’ Longbottom and Sam Brown saw ‘Upkeep’ perfected as a successful weapon.

Recovered with three others in 1977, this example has been loaned to Brooklands Museum by the Royal Air Force Museum since 1987. Similar examples recovered from Reculver Bay in 1975, and another retrieved in 1997, are preserved in other UK aviation museums. One is also proudly kept by 617 Squadron at RAF Lossiemouth in Scotland and another survives at RAF Scampton. Altogether eight of these test specimens are believed to survive.