Zond 5

• 1. Introduction

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  Zond 5 launched on the 14th of September 1968 at 21:42 UTC from Site 81 at the Baikonur Cosmodrome, carrying a crew unlike any before it: two Russian tortoises, a clutch of fruit fly eggs, and a collection of seeds and algae. When the spacecraft looped around the Moon and splashed down in the Indian Ocean six days, eighteen hours, and twenty-four minutes later, it had written a genuinely strange chapter in the history of space exploration. How did tortoises become the first complex animals to travel beyond low Earth orbit? Why did American officials receive an alarming phone call from President Johnson in the middle of the night? And what did a British astronomer conclude after watching it all unfold? Those are the threads this documentary will pull.

• 2. A Program Built on Failure

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  Before Zond 5 could fly, the Soviet program had to survive a string of disasters. Out of the first four circumlunar missions the Soviets launched, only one, Zond 4, achieved even partial success during its mission in March 1968. The next attempt, called Zond 1968A, failed on the 23rd of April when an erroneous abort command shut down the Proton rocket's second stage mid-flight. The escape system fired correctly and saved the descent module, but the mission was lost. Three months later, during preparations for Zond 1968B, the Block D upper-stage rocket exploded on the launchpad. Three people were killed. The Proton first-stage booster and the spacecraft itself survived with only minor damage, but the program's momentum had been badly shaken. It was that accumulating toll, two failed launches and a deadly explosion, that pushed Soviet planners to make a pivotal call: the next flight would carry no cosmonauts. The fear of a failed crewed mission and the propaganda damage it would cause was simply too great. So when Zond 5 rose from Baikonur in September, the pilot's seat held not a cosmonaut but a mannequin fitted with radiation sensors, placed there by the Russian Academy of Sciences to measure what a human body would have experienced.

• 3. The Tortoise Passengers

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  Soviet scientists chose tortoises, specifically Agrionemys horsfieldii, for a practical reason: they were easy to secure tightly inside the vehicle. Each of the two space-bound specimens weighed between 0.34 and 0.4 kilograms before the flight. Twelve days before launch, they were placed inside the spacecraft and denied all food and water. Two control tortoises on the ground were subjected to the same deprivation. The deliberate starvation was not cruelty but methodology, designed to support pathomorphological and histochemical experiments. Beyond the tortoises, the biological payload was broad. Fruit fly eggs were aboard, along with cells from wheat, barley, pea, pine, carrots, and tomatoes. Specimens of the wildflower Tradescantia paludosa traveled alongside three strains of the single-celled green algae Chlorella and one strain of lysogenic bacteria. The point of this variety was to test the effect of cosmic radiation across different life forms. Scientists noted, however, that the chosen organisms were all extremophiles, creatures with a substantially higher radioresistance than humans, which limited how directly the results could be applied to the question of crewed spaceflight. When the tortoises were dissected on the 11th of October, after a total fast of 39 days, the flying pair had lost 10% of their body weight. The control tortoises had lost only 5%. Yet the flying tortoises showed no loss of appetite. Blood analyses from the space-traveling animals and the ground controls revealed no differences. A separate analysis did find elevated iron and glycogen levels in the livers of the flight tortoises, along with changes to their spleens. The authors concluded those differences traced back to starvation, not spaceflight.

• 4. Around the Moon and Back

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  After the Block D upper stage placed Zond 5 into a parking orbit of 191 by 219 km, Mission Control quickly discovered a problem. The spacecraft's attitude control system was not behaving correctly. Engineers traced the fault to a contaminated star tracker: heat inside the vehicle had caused interior coating material to outgas, fouling the sensor. The attitude correction maneuver had to be delayed and was eventually performed 325,000 km from Earth, using the Sun and the Earth itself as reference points rather than the stars. On the 18th of September the spacecraft flew around the Moon at a closest approach of 1,950 km, without entering orbit. On the return leg a second star tracker failed, and the guided reentry system switched itself off erroneously. Eight ships had been pre-positioned in the Indian Ocean before launch as a contingency, though only three of them carried rescue helicopters. That precaution proved necessary. On the 21st of September the reentry capsule entered the atmosphere, bypassed its planned landing zone in Kazakhstan, and splashed down in the Indian Ocean. Recovery ships Borovichy and Vasiliy Golovnin retrieved the capsule; it had landed 105 km from the nearest Soviet naval vessel, at night, which complicated the recovery significantly. U.S. sources would later point out that the steep reentry angle would have been unsurvivable for a human crew, and that the Indian Ocean landing rather than Soviet territory meant the recovery itself took ten hours. High-quality photographs of the Earth, taken from a distance of 90,000 km, were among the mission's scientific returns, and were described as the first photographs of their kind taken at that distance.

• 5. The Space Hooligan Incident

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  On the 19th of September 1968, as Zond 5 was rounding the Moon, Jodrell Bank Observatory and the CIA both intercepted something unexpected: voices. Cosmonauts Valery Bykovsky, Vitaly Sevastyanov, and Pavel Popovich could be heard transmitting from the spacecraft, apparently reading out telemetry data and discussing the possibility of attempting a landing. The transmission caused genuine alarm in the United States. Apollo 17 astronaut Eugene Cernan later said the incident had "shocked the hell out of us." Popovich would eventually explain what had actually happened. The cosmonauts had engineered a prank. Engineers at the Yevpatoria mission control center in the Crimea connected the receiver on the probe to its transmitter with a jumper wire. Popovich took a microphone and narrated a fake in-flight report as though he were circling the Moon, and the signal bounced off the spacecraft and returned to Earth convincing enough to fool foreign listeners. President Johnson, identified in Popovich's account by his role though Popovich mistakenly named Nixon, called the U.S. space advisor Frank Borman to ask why Popovich was reporting from the Moon. About a month later, Borman traveled to the Soviet Union. Popovich was sent to meet him at the airport. The moment Borman stepped off the plane, according to Popovich, he shook his fist and called Popovich a "space hooligan."

• 6. What the World Concluded

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  British astronomer Bernard Lovell, identified at the time as Britain's foremost space expert, declared after the mission that the Soviets had demonstrated a genuine lead in the Space Race. The British Interplanetary Society went further, stating its belief that the USSR could send cosmonauts around the Moon within a matter of months. The Soviet news agency TASS waited until November 1968 to confirm publicly that the flight had carried living animals. That same month the Soviets announced that Zond 5 had been conceived as a precursor to a crewed lunar spacecraft, a statement timed deliberately one month before the planned Apollo 8 flight to signal Soviet ambitions. American officials pushed back on the rosy picture. In October 1968, U.S. sources had described the mission as less successful than Soviet announcements suggested: the spacecraft had not passed close enough to the Moon for useful lunar photography, the reentry angle was too steep for human survival, and the Indian Ocean splashdown was an unplanned deviation. The Zond 5 reentry capsule now sits on display at the RKK Energiya museum in Moscow Oblast, a physical remnant of one of the most closely watched moments in the contest to reach the Moon.