im really not all that sure but i would say boil it anyway. thats what i did
alsoi have been told this but im not all that sure but the longer you boil it in hot water the quicker it will sink unassisted by rocks and whatnot.
hope this helps.
regards community begginer.
in my experience the wood rots faster if you boil it. I'm not saying this is a fact with every piece of wood, just with those I've boiled. You could bake it.