Comment: Very interesting, with intriguing possibilities

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Very interesting, with intriguing possibilities

Depending upon how much weight could be put onto, yes onto it, one could use this as a bunker structure. Adapting it to have air and water intakes would be relatively easy ( concrete saw blade ).
If it could handle being underground say, 40 feet, then you've got the cheapest and most easily installed bunker kit yet.
The same material could be cut while pliable into a stairway/ well, a exit tunnel twice it's original length.

Some present bunker manufactures charge well over $100,000 for a bunker not much larger in size than this is, though they do provide the venting/ pumps, and access ways.
But still, 16K is cement cheap, so buy four and make room for your extended family.

I like it.

God Bless

Drew, by the very grace of GOD through the blood of Christ Jesus.
"there shall come after us men whom shall garner great wealth using our system, and having done so shall seek to slam the door of prosperity behind them." George Washington