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The front quarter of the UNSC Roman Blue crashed on the dark side of the moon in 2535 after being cut in half by an energy beam at the Battle of Chi Rho, it remained there for 22 years before being discovered and then immediately destroyed.
The moon is tidally-locked, give it a light side and dark side comparable with Earth's moon, Luna. This dark side is very cold, and only its equator even barely support human life, with temperatures dropping to -35'C even a few kilometers north or south of the equator. Water is present on the moon as the surface of the dark side of the moon is covered in snow. EVA suits with oxygen tanks are required meaning that the moon has no breathable atmosphere. The surface temperature is so cold that it can flash freeze water and anyone not fully protected by a EVA suit.