Neil Armstrong didn’t believe in omens, but he got a nasty one anyway the moment he climbed into his Gemini 8 spacecraft on the morning of March 16, 1966. If Armstrong had believed in omens, he might have been better prepared for what the rest of the day held for him.TIME’s Jeffrey Kluger takes you through the Gemini 8 mission and the events that make it one of the most harrowing space missions of all time

S1E3: Apollo 1

Space does not wish you well. It has no shortage of ways to kill you, and in the fifty years humans have been flying spacecraft around the Earth and out to the moon, the mortal perils have been evident. But ten of the missions were the most harrowing of all. Some of them ended in tragedy, some ended successfully—but all of them involved astronauts playing for the very highest stakes in the very deadliest place.  Countdown tells the tale of those ten missions—some of them American, some Russian. Written and narrated by Jeffrey Kluger—author of Apollo 13 and Apollo 8—Countdown recreates the space crises that every astronaut has feared, and that an unlucky handful were forced to live.