DISCUSSION:Unconventional fallout shelters including caves, tunnels, culverts, and others. Are they a “Go” or a “No-Go”?

From time to time people ask about using some pretty unconventional locations to shelter from fallout. The title lists some of them, but in general, we might be talking about anything from traffic and pedestrian tunnels to large culverts and stormwater drainage systems. I think it goes without saying that as you get to the latter end of the spectrum, the hazards you could encounter increase. Some examples of the hazards you could encounter with these locations are O2 depletion or…