When we dug those Bren gun carriers out of a marsh/beach 8 years back, it was clear to see the difference where clay preserved and sand allowed rust. Between the clay, and the fact that omst things are frozen half the year here in Manitoba, a lot of the small rubber pieces and wood were well preserved, whereas on a carrier that had not been buried, these would have disentegrated long ago.
I think one of the guys salvaged one of the transmissions, but certainly the engines were all boat anchors.
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