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.