My friends router just reset itself and when he came back he was in the water and had lost the boat and black metal he was carrying etc.

He made it to shore by logging out when almost out of stamina. Apparently stamina is full when you log back in. He came ashore at night in a goblin village but made it out alive.

But that was a disconnect on his server, not a "log out" as such. Not something I want to try and regret though.