Which is why these installs usually involve all sorts of external waterproofing, concrete encasement, galvanic/cathodic protections & sacrificial anodes, drainage systems, and interior climate control. They don't just bury the expensive fuselage and call it a day.

Wanted to check how long the process would take buried naked and cursory search is maybe 5 to 15 years. Sooner with wet weather.

It's sitting on a concrete base and will have concrete pours around it.

Which is only a problem if it’s in contact with the soil.