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“The underground storage tank–60 meters long, 53 meters wide and 6 meters deep–is lined with an outer 6.4 millimeter-thick layer of clay, and topped by two layers of polyethylene sheets, each 1.5 millimeters thick.”
This would be a total of 3 mil plastic. Other reports mentioned there might be 3 layers of plastic sheet used, that would only make it 4.5 mil thick.
For some contrast trash bags used to line trash cans are frequently 1.5 mil or thicker.
Liner used for koi ponds or commercial lakes is 20 mil thick.
Other koi pond liners found that are also cited as being suitable for some types of industrial ponds is 40 mil thick.
So the question is who thought this was appropriate and who approved this design using was equaled trash bag plastic.
... Only place it can go - seawards.
It is not announced where the water went.