Mars Probe 13

Mars Probe 13 was a British spacecraft sent on a mission to Mars in 1977. On Mars, the Mars Probe 13 astronauts accidentally wandered into the city of the Argyre Clan Ice Warriors and were slaughtered after they spied on a research facility. To appease the Ice Warriors, the British government's representative, Minister Grayhaven, had mission commander Alexander Christian framed for the astronauts' deaths and imprisoned. He agreed to ensure humanity would not return to Mars. For the next two decades, the British secret service spread disinformation that Mars was uninhabitable and sabotaged NASA data in order to discourage Mars missions. In actual fact, Mars' atmosphere was breathable. (PROSE: The Dying Days)