Whoa.
I like this one...The B53, on the other hand, with a force equal to 9 million tons of TNT, penetrates the earth simply by creating a massive crater, rather than the more precise downward blow of the B61-11.
The 8,900-pound, nine-megaton B53 device, a bomb initially designated as an earth-penetrating weapon. It is far larger than even the greatest conventional non-nuclear device in U.S. stockpiles and it is several times more powerful than the atomic weapons dropped on Japan in 1945.