I cut my fathers floating pier into pieces with a Stihl 026. The pier was on its last legs and most of the flotation material had disinegrated. I didn't like the idea about putting saw bar in water, it made a real mess, water flying everywhere, but it did the trick on the water logged wood. I took saw apart afterwards and let it air dry. The saw made out just fine. A suggestion, you may want to use enviromentally friendly chain oils, they sell such a product for people who use their saws in state parks/game lands (mandantory). Or, if u have an old chain, you can probally run it in the water with no chain oil, shouldn't heat up to badly. Reminds me of the TV series "SWAMP LOGGERS" those guys jump right in the water with the saws screaming, cutting those logs, I couldn't imagine........ good luck.