In September 1968, the CIA and Jodrell Bank intercepted Russian cosmonaut voices coming from a Soviet spacecraft near the Moon, and Washington briefly believed the space race was lost. The truth was stranger: the only Earthlings aboard Zond 5 were two starved Russian tortoises, known only as number 22 and number 37. This deep dive reconstructs their journey from declassified records and mission logs, explaining why the Soviets put reptiles in a capsule built for humans after a string of catastrophic Zond failures, including a pad explosion that killed three people.

We follow the mission through a blinded star tracker, an improvised navigation fix using only the Earth and Sun, the lunar flyby, and a brutal ballistic reentry that splashed down at night in the Indian Ocean under the watch of a U.S. intelligence ship. We also unpack the cosmona ...