Grand Slam
As a schoolboy in Wilhelmshaven after ww2 It was possible to go to many places that Health & Safety would have had a fit about these days. I was shown a hole in the top of the U-boat pens supposedly made by a Grand Slam bomb which subsequently exploded deep underground. Also remember the Army engineers detonating some dangerous explosive
which caused most of the remaining windows in that part of town to shatter. Apparently they forgot to inform the locals what they were up to.