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What natural disaster could quickly drain a "lake" lined with stainless steel? All that water needs somewhere to go.

I assume a straightforward geological study would prevent events like https://www.theguardian.com/world/2022/jul/22/man-dies-after...

Straightforward studies are often not done. And, often done then ignored.

Dams collapse mainly for this reason, and those, while killing many people and destroying whole cities, do not leave the whole region uninhabitable.

It is much more difficult to build a dam than a water-filled hole.

I don't know, but I suspect we will find out if we end up having these "lakes" distributed all over the world