[howthisends]

When shut off from the world above, the city was ventilated by a total of more than 15,000 shafts, most about 10 cm wide and reaching down into the first and second levels of the city. This ensured sufficient ventilation down to the eighth level.

[4gotunameagain]

would connecting the ventilation shafts exclusively on the lower levels create some kind of draft ?

[woleium]

I imagine the lower relative temperature of the well shafts would cause cool fresh air to sink, and the heated (by humans and animals) stale air would rise up and escape via the mentioned shafts, much like a traditional passive heating system in an old house. As long as the area doesn't get too humid (unlikely in that area) then the latent heat of evaporation would generate more than enough temperature delta to setup quite strong air currents, more than enough to keep the air fresh in the caves

[mrcheesebreeze]

thats so cool