Comments: While repairing the Stage 2 Oxidizer, a dropped tool creates a fuel leak from a missile, which is crowned with the largest nuclear warhead in the U.S. arsenal! As the fuel gas fills the underground silo, the concern is the 5 megaton warhead.
This WGBH (PBS) documentary explains what happened in the autumn of 1980 in Damascus, Arkansas at Missile Silo 4-7, which housed a Titan II nuclear warhead. The basis is a book.