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Originally Posted by Michael Blalock
but could a ferrous sword have actually been at the bottom of the Danube river for hundreds of years as described and not rust away?
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It is possible that sediments deposited on the river's bottom, can create a soft layer devoid of oxygen and high in nitrates. If ferrous metal sunk into this layer and was covered up quickly as it sank: it would be possible that the oxidation of the blade would be much slower.
It seems unlikely to be the case with the sword in question though