The US military decides that P-1 is flaky and unstable and attacks the building. P-1 attempts to "spirit away" over microwave links, but this is discovered and the antennas destroyed. An assault on the underground facility follows, which P-1 initially attempts to block by exploding devices planted around the building for self-defense against precisely this sort of assault. P-1 is eventually convinced to allow the assault to succeed to avoid loss of life. As soon as they enter the computer room, the soldiers start setting up explosives to destroy P-1, and Gregory is killed when he attempts to prevent this. Upset that Gregory is killed, P-1 detonates the remaining explosives in the building, destroying everything.