BBC TV digging for Grand Slam
I believe that only one Grand Slam was dropped on the UK and that this was in the New Forest at Ahley Walk Archaeologists are exploring a buried World WarTwo target building in the New Forest where the biggest bomb ever dropped by British forces was tested.
The following is from the BBC, who showed a piece last Wednesday 22 January on South Today.
The Grand Slam, nicknamed Ten Ton Tess, penetrated the ground and sent shockwaves to damage enemy bunkers.
It was tested on a concrete structure known as the Ministry of Home Security Target at Ashley Walk bombing range.
After the war the building was covered up. A radar survey is now trying to find out what remains of it.
A team from Wessex Archaeology is also using electrical resistance tomography (ERT) and gradiometers to build the picture of what is left.
The Grand Slam bomb, which weighed 22,000lb (10,000kg), was developed towards the end of the war and tested at the site near Fritham on 13 March 1945.
The next day it was dropped over Germany, destroying the Schildesche railway viaduct near Bielefeld.