The setting is Kansas City, a few centuries after the apocalypse. The Worshippers Of Uranius, a band of 700 mutants, are the only inhabitants of KC, besides a few human slaves from out west. The Worshippers think that Uranius, a nuclear warhead that wasn’t deployed in the apocalyps, is a god, and they worship it with religious reverence.
The Worshippers remain neutral in the conflicts of the wasteland until year 2557, when the Midwestern Empire started their great conquest of the Great Plains. The Worshippers had only a few rifles and little ammunition, so the fight seemed doomed. But, the mutants remembered that they had Uranius on their side.
And so the ritual began
All 700 mutants gathered together in the church hall directly above the Uranius Silo. Every single one was on their knees, praying that Uranius would rapture them to heaven. As they were praying, two other mutants below, in the silo had just finished their last prayer, and a young novice handed them a metal box, which contained the activation codes for Uranius. The went to the holy bomb, and when the Imperial army approached the city, ready for victo.....KABOOM.
Uranius was a 50 megaton bomb, and the silo that contained it was 150 feet deep underground. My question is, what would be the effects of a bomb exploding that deep under the surface, with that yield?