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The ultimate design of what had become known as the UPKEEP mine. The spherical casing was removed during tests at Reculver between 21 April and 1 May 1943. This was done as the casing tended to shatter on contact with the water, but it was noted that the metal cylinder containing the explosive continued on its course. From now on the cylindrical shape was used.
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During this period a smaller version of UPKEEP codenamed HIGHBALL was developed as an anti-shipping weapon. Although it entered RAF service it was never used.
Browse the Dambusters exhibition using the buttons below:
To commemorate the 65th anniversary of the "Dambusters" Raid the Royal Air Force Museum in conjunction with the Newsdesk Media Group has produced a new book "Breaching The German Dams - Flying into History" which uncovers elements of hidden history crucial to the success of 617 Squadron's attack on the German Dams in May 1943. To order your copy go to the Museum Shop.
RAF Museum Shop