 these radio checks from building to building and trying to test the operation of the capsule with the power, the external power unplugged. And then this spark happened inside the spacecraft, and it had this pure oxygen environment, and it pumped up to 15 pounds PSI. And at that pressure, it becomes very explosive, and the fire just took them within minutes. Gus Grissom was one of them, Roger Chaffee and Ed White, of course. And didn't Gus...