Each pre-war era started construction and was eventually preserved as an underground fortress that can still be used after the war.

Basically, they all applied the most advanced architectural concept technology and high-strength applied materials of that era.

Whether it is the impact and shock of frontal nuclear warheads or frequent earthquakes caused by crustal movement, they have always perfectly survived difficult environmental tests time after time.

Of course, there were also many people who kept heavy weapons. After the war, more than

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