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... drainage system was established, it was very unusual for underground civil air defense facilities to be free of waterlogging.
Especially in a place like Tianmen City, where nine rivers flow to the sea, don’t even mention underground air-raid shelters; if you dig a well three meters deep on the ground, by the next day, it could be filled with water.
Initially, Wang Yunxiao couldn’t understand why there was such a well-preserved underground civil air defense facility beneath Qingh ...
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