I’ll add to other comments but… it depends on the water temp and what is in it. Old ships that are pulled up in some places have no wood left, others have a full hull. Most treasure wrecks in warmer water get wrecked by worms and parasites. Some in the same areas get covered deep in sandbars are just fine.
There have been wrecks pulled up in the Med that are in tact, other are gone except the fasteners. Unlike metal (air is the enemy) wood has many different issues. If the wood is in hypoxic areas that are cold they will last forever.
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