Posted by Ombwah somewhere between 7-8 ft, I could walk completely upright, no obstructions save a few spiderwebs. In a week or two, I hope to go back in with someone else and see how far bakc we can get. I have a city produced infall map (they only gave me a map of the inlets, all sizes look the same, kind of a puzzle.) But I think these two corridors go all the way to the River. (3/4 a mile? More? It's deep.)
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Yeah, from what I saw on google earth, it must meet up with the river at some point.