Anyone know what this is I found in a crawlspace?

This crawlspace had tunnels dug throughout and some sort of concrete cistern. I have no clue.

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Wish I could help, but following this for input from the experts. Thanks!

Clients name Jeffry Dahmer?


Yes, I wrote that up in my report. I have just never seen anything like this.

This is just a guess:

  1. The tunnels are dug out so one can walk around comfortably (not crouched)
  2. The concrete hole was custom and made to store valuables in case of fire etc.
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It looks like a A cistern. Age of the building?