• Bobson_Dugnutt [he/him]
      ·
      3 years ago

      the ground is porous and oxygen flows in through the earth

      I'm pretty sure this isn't true, but I'm not a dirt scientist. You might get radon gas seeping through the earth though.

        • Bobson_Dugnutt [he/him]
          ·
          3 years ago

          I think it all depends on how much air is flowing through the cave or tunnel (either naturally or with fans) and how many people are in a confined space breathing at any moment. With mining or tunneling you can also hit pockets of methane or other gasses that can be explosive or displace oxygen, but I think that's mostly a hazard in coal mines.