Missile silos on land were invented to hold the Blue Streak missile [1] and the problems you describe with hiding them were a large part of the reason to cancel

Missile silos on land were invented to hold the Blue Streak missile [1] and the problems you describe with hiding them were a large part of the reason to cancel the programme. [1] http://en.wikipedia.org/wiki/Blue_Streak_%28missile%29 http://en.wikipedia.org/wiki/Blue_Streak_%28missile%29