RAF de Havilland Mosquito DZ473 were sent from Leuchars to photograph damage from Allied bombing at the Stettin railyards: "On leaving Stettin, we left our cameras running all down the north coast of Germany, and when the film was developed, it was found to contain pictures of Peenemünde." The Medmenham interpreters studied the elliptical earthworks (originally photographed in May 1942) and noticed an "object" long projecting from what was thought to be a service building, although it had mysteriously disappeared on the next frame. On 22 April 1943 a large cloud of steam was photographed near the embankments, which was later identified as coming from a rocket engine being test fired. Duncan Sandys' first photographic reconnaissance report on Peenemünde was circulated on 29 April 1943, which identified that the lack of power-station activity (Germany had installed electrostatic dust and smoke removers on the power station near Kölpin) indicates that "The circular and elliptical constructions are probably for the testing of explosives and projectiles. ... In view of the above, it is clear that a heavy long-range rocket is not an immediate threat." Then on 14 May, an "unusually high level of activity" was visible at "the Ellipse" on photos from two sorties on 14 May, which was the date the Reich Director of Manpower (Gauleiter Fritz Sauckel) was a distinguished visitor at a launch. The first solid evidence of the existence of a rocket came with a sortie (N/853) on 12 June, when a Spitfire flown by Sqn Ldr Gordon Hughes photographed Peenemünde: one photograph included an object on a railway truck. Reginald Victor Jones identified the object on 18 June as "a whiteish [sic] cylinder about 35 feet long and 5 or so feet in diameter with a blueish nose and fins at the other end...I had found the rocket." After Operation Hydra bombed other areas of Peenemünde in 1943, the P-7 blockhouse roof was reinforced, and in a 1944 raid, the blockhouse occupants suffered one injury when a periscope fell. (Hermann Weidner's Test Stand 8 was lost in the 1944 July and August raids). The last V-2 launch at Peenemünde was in February 1945, and on 5 May 1945, the 2nd Belorussian Front under General Konstantin Rokossovsky captured the port of Swinemünde and the Usedom island. Russian infantry under Major Anatole Vavilov stormed Peenemünde and found it "75 per cent wreckage" (the research buildings and test stands had