To save your civilisation's communal cultural outpourings, find a geologically secure area, well above sea level. Hook up some marble engraving machinery to a computer, get a huge number of small interlocking slabs, and carve on them the text and images of our society's core works, reference, patents, works of literature, belief, and instructional manuals. And don't forget a Rosetta-style key. Then slot them together to form a pyramid, and build a marble shell. The Egyptians knew what they were doing.
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