I had a boat crack in two on Amistad crossing moderate wave. Insurance sawed a section out and stringers were broken and foam was acting like a sponge holding water Foam apparently chemically had broken down.
Before I had noticed boat seemed heavy on water and I mistakenly blamed engine. Also noticed hull was developing spider cracks, some that dripped for days after being returned from water.
Insurance made my day.
Very dangerous to have water logged foam in a boat.