Amsterdam is similarly build on a lot of wooden poles. Because the ground water has always been high enough, some of these beams easily last for centuries. I’m assuming the same principles are at work in Venice.
https://medium.com/big-questions/beautiful-amsterdam-built-on-poles-who-would-pay-if-it-all-fell-down-7ae7436a73de
Medieval Copenhagen was also build on wooden beams.
The land Copenhagen is build on, is mostly wetlands, though almost all of it is now drained.
When old foundations are removed, you can get these ancient wooden beams out of the ground, that have these beautiful dark veins from being submerged for ages. They used to be sold to woodworkers for furniture material, but AFAIK since it happens so rarely, they are given to the archaeologists of the national museum.
Sunken logs do go for a rather high price, than normal timber, due to their special look.
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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