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This depends on the individual piece of wood. Bog oak can be incredibly tough as the fossilisation process has started and the minerals from the water deep into the wood.

Replacing the water with resins isn’t needed as the original shape won’t be retained (unlike a ship or relic). Care must be taken during the drying process to avoid warping though.

I grew up in the Fens and it every few years a farmer would uncover a piece of bog oak and leave it at the edge of a field.