Von Braun had been under SD surveillance since October 1943. A secret report stated that he and his colleagues Klaus Riedel and Helmut Gröttrup were said to have expressed regret at an engineer's house one evening in early March 1944 that they were not working on a spaceship and that they felt the war was not going well; this was considered a "defeatist" attitude. A young female dentist who was an SS spy reported their comments. Combined with Himmler's false charges that von Braun and his colleagues were communist sympathizers and had attempted to sabotage the V-2 program, and considering that von Braun regularly piloted his government-provided airplane that might allow him to escape to Britain, this led to their arrest by the Gestapo.