PREVIEW
... ow to improve the ventilation system of the base, which is one of the most pressing problems for an underground shelter.”
As Su Mo sat on the stiff wooden chair that poked his butt slightly, he tried to recall the knowledge he had from the civilization era.
As well as shelter designs from doomsday movies…
Underground shelters required a large air filtration and regulation system, but having any ventilation ducts that connected to the outside was a safety hazar ...
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