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The Earth's orbit will go through many Milankovich cycles plus anthropogenic climate change on the top, all of Warrnambool is going to be very deep underwater over the next million years.
Same with all coastal cities. Sea level will probably rise at least 70 masl over the next million years.
Your friend is wasting his time putting it in plastic. Needs a stainless steel welded high strength pressure vessel designed for deep sea submersion. There won't be anybody here to dig it up. The human race doesn't have many more generations to go. We've consumed most of the resources of the planet in the past 300 years.
Attached are the latest sea level predictions for the year 2150, 130 years from now for Brisbane, Gold Coast and Northern NSW coast, Sydney, Melbourne, Warnambool and Adelaide. This is 1/15 of the expected sea level rise over the next million years.
Joe
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