On his return journey, Zhang Qian and his men were caught again.
返程时，张骞一行又被抓。
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Back from 'Mars' Six men have survived 520 days cooped up in 3 small rooms at the Institute of Biomedical Problems in Moscow, where they were simulating the isolation of a journey to Mars and back.
The rations they had packed for the arduous dog-sled journey across Antarctica proved insufficient, so Amundsen and his men decided to shoot and eat some of their dogs.