Tang Yue took about three hours to move all the solar panels into the garage. By the time he was done with the work and returned to the Kunlun Station, it was completely dark outside. Tang Yue was also exhausted.
He nearly had to crawl into the airlock before closing the hatch door. The sanitation system blasted high-temperature steam at his EVA suit, cleaning off the dust and sand from his clothes. This was a necessary procedure, both for hygiene and safety reasons. Astronauts were not to randomly bring contaminants from outside into the Hab. By the same logic, in order to prevent contamination, the waste produced by the astronauts couldn't be randomly thrown onto Mars.
However, Tang Yue no longer needed to abide by the final rule. No one would care if he took off his pants and defecated on the peak of Olympus Mons—as long as Tang Yue didn't care for the survival of his ass.
