Me and some friends used the raft early in game probably close to when we unlocked it. Eventually we made it across the ocean, started building a base , at night, and eventually died in our leather gear.

Never tried it again until we were bronzed out and had a karve.

One night we were sailing the ocean again and heard a loud thud. Someone was like "wtf was that" , then we heard it again , sure enough a serpent rears up. we knew nothing up till that point. Someone said "were going to need a bigger boat, and we all died at sea that night.