Probably it's more like a bog than just a sink hole. A bog doesn't let air to the object that's been sucked down, so it won't rust (or decompose for that matter - remember the Bog bodies? http://en.wikipedia.org/wiki/Bog_body )Originally Posted by cash_site
Cleaning up or restoring stuff that's been in a bog is a hell of a lot of work. My brother is an instrument mechanic in the army, and he got in some instruments from a Leopard tank that got sunk in a bog.
Even though the instruments were air and gas tight, the bog was everywhere inside them. The pressure in the bog had pushed particles and mud into everything. From what I remembered, the way they got it out was to wait until winter, let the top of the bog freeze, dig off the top layer, let it freeze agian, dig off and so on, until the entire tank was excavated.
Johan-Kr
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