Thursday, December 17, 2015

Diagram of a Vietcong Tunnel Complex

I found this diagram to be interesting:

Source: Survivalist Boards (more information, including video and photos, at the link)


  1. 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.

    1. Good point. There must have been techniques developed for 19th century mining/construction that would be simple to implement.

    2. Nineteenth century mine ventilation techniques still relied on mechanical fans of some sort, although they were crude by current standards.

      Pre-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.


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