5. The Germans may have one of two reasons for postponing the launching of BIGBEN. They may either:(a) Be faced with a physical limitation of which we have no knowledge and thus be unable to use the weapon effectively or with safety. Our knowledge of the projectile and all the processes involved in production and operation is still so incomplete that such limitations would be likely to be unknown to us. or (b) While able in fact to launch BIGBEN now, they may have decided only to launch the operation at greater intensity.