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Thursday, December 17, 2015
Diagram of a Vietcong Tunnel Complex
I found this diagram to be interesting:
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Ragnorok Part XIV -- Escalation
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Interesting diagram. If this complex is on flat ground, forced ventilation is almost a requirement - definitely a requirement if any kind of fire is used for cooking. If on a hillside, natural ventilation (air movement via intake at lower elevation openings, and exhaust at higher elevation openings) will provide necessary ventilation. Ventilation of underground workings/complexes is not a trivial problem - at least if those inhabiting the workings/complexes are going to be breathing safe air.
ReplyDeleteGood point. There must have been techniques developed for 19th century mining/construction that would be simple to implement.
DeleteNineteenth century mine ventilation techniques still relied on mechanical fans of some sort, although they were crude by current standards.
DeletePre-industrial revolution mine ventilation at best consisted of multiple vertical shafts (or a single shaft split in two, with one side being for fresh air and the other for exhaust) with some mechanism, such as a fire, to force the flow of air via convection. There is also research suggesting ancient miners may have used wind deflectors to deflect the air of prevailing winds down shafts - again multiple shafts were required.