On January 27th, 1967 , three astronauts — Gus Grissom, Ed White, and Roger Chaffee — climbed into the Apollo 1 capsule for what should have been a routine ground test.It was the first manned spacecraft of the Apollo program.It never left the pad. A flash fire tore through the cabin in seconds.In the oxygen-rich atmosphere, the flames spread with explosive speed.The crew never had a chance.They were trapped behind an inward-opening hatch , sealed shut by the rising pressu