13' tall walls are not that expensive. 13' THICK walls, maybe.
I fully expect a fortified place (course I do see windows in the pics) to cost more, but this is not a Saddam Hussein underground bunker. IT's a slightly beefy house. Also, it's built in a country with a per capita income of ~$1050. That's like 36 times lower than the US. I'd expect costs to be lower than $333/ft^2 in a place where the labor costs (compared to the US) are effectively zero.
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"Government, even in its best state, is but a necessary evil; in its worst state, an intolerable one." — Thomas Paine
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