It seems I made a mistake calling this thing a bunker. The better term
then would be an extend cellar made of reinforced concrete a foot
He has a bungalow and a garden which is enclosed on both sides by
neighbours and the only place to put his workshop is underground.
He makes a pretty pound as a designer, architect and property lawyer.
His hobbies are numerous but mainly he needs space to draw plans and
build models. He's not too bright on the implementation of his ideas,
like hollowing out telegraph poles.
Thanks to your kind words he's dropped the idea and is lowering the
domes into a 3' high raised flower bed. The domes will be part of the
retaining wall which means this is no longer my concern.
For that I thank you.