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Used an aluminium plate to store the seed words.
Hidden inside a WW2 shipwreck in the pacific, in a spot safe from potential structural collapse. At a depth accessible only to technical divers.

As a container, utilised an spare Sony RX100 underwater housing (with an adequate depth rating) that required a vaccum pump for standard operation, filled with mineral oil before vaccum pumping to prevent implosion by reducing pressure on the housing with a denser liquid. Further sealed with aviation speed tape and placed inside a small ammo box that I expect to rust and blend in with the surroundings.

I have other spare copies, but all segmented and geocached throughout the country.