Not sure if it’s true, but in my childhood I have heard that they used a larch. This tree has a very dense and hard wood and absolute protection against fungus. Back in a days I helped my grandpa to build shelves in a cellar and he used larch wood for them. Many ears after ithose shelves were as good as new with no trace of decay.
I can easily believe that large poles would survive hundreds of years in the salt water with no integrity loose.
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