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by scotty79 2037 days ago
Isn't it hollow?
2 comments
bni 2037 days ago
I would bet it is just metal sheets cut to size and then riveted or screwed together on site, then filled with rocks for stability. Metal sheets could be carried there, hole dug out and then assembled by 1 person basically.
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rtkwe 2037 days ago
It looks to be. In this video you can see what are most likely rivets holding the sheet metal sides on.

https://youtu.be/LUFyGGU0cxo?t=37

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