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Originally Posted by wilconqr
Thanks for the heads up! I just can't fathom how that thing remained in such fine condition after ? years. Is it that the water is just that fresh and cold? They really look like they were just ran in and then back out of the water. The fifth video down shows them running an engine. Presumably the T-34 once they got it fixed up back in the shop?.?.?.?.?
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It depends on how much air, specificly oxygen, is disolved in the lake water. Those sort of lakes frequently have 'dead' water begaining a couple meters below the surface. Without the dissolved oxygen there is very little corrosion. If silt or other inert sediment quickly covers the metal then corrosion is highly inhibited. Conversely a lake or river with a steady circulation of water from surface to bottom will have pleanty of dissolved oxygen for corrosion. If the water is acidic then the corrosion occurs all the more quickly.
The timber industry used to take advantage of 'dead' lake water to sink & preserve surpluss logs, instead of building expensive storage sheds. Occasionally forgotton caches of now rare hardwoods are turned up to the delight of cabinet makers.