Mysterious Manhole, Buried Two Feet Underground?

We dug down two feet at this marker and this is what we found!

We’re working to turn this bunker into our home!

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our bunker as we work on our undergroundbunker/underground bunker for our channel undergroundliving/underground living for this bunker renovation which we want to take off grid and keep as a nuclear bunker so this fall out shelter is made for prepper and prepping as a modern homestead that's underground for survival and survivaltips/survival tips in case SHTF we don't have to bugout but will have a garden in case of doomsday prepper for this renovation to become offgrid but first we need to dig up and discover what this ancient manhole buried two feed underground is