They did not build a bigger bomb, they just used what they had in an elegant fashion. Rather than target the actual site, the British targeted the perimeter of the site. The bombs would detonate to the side and below the actual target, leaving a huge hollow cavity that the hardened facility would slide into.
Think of it as creating an artificial sink hole close enough to you target, so said target falls into the void.
I don't see why this would not work in this case. Oh...my bad...we actually have to have someone in charge that would carry out the attack.
Though popularly believed to be so, WWII bombing just wasn’t that accurate. Here’s one example -
“At the same time, Britain’s air force began to realise that its bombers were not able to find and hit specific war targets such as airfields or armament factories. An investigation revealed that just one in five aircraft was succeeding in dropping its bombs within five miles of its target. Under such circumstances, the bombing offensive could only be effective if it was directed at targets as big as cities.
The Americans too found themselves moving towards area bombing of cities. Although they would continue to claim that they were engaged in ‘precision’ bombing of military targets, 80 per cent of their bombing missions in the last quarter of 1944 relied on radar. Half of their bombs missed the aiming point by more than two miles.”
I like the WWII Disney bombs developed by the Brits, but used by the US.
Then we can develop the “Victory Through Airpower” Earthquake Bombs.