I was playing in my friend's game, and I was mining in a cave, then, my friend must have turned his game off, because it said disconnected from server, then, when I asked him, he said his computer ran out of power. The next day, I played on his world again, and I somehow started in a water ditch with no air bubbles, and I was already down to 12 health. I drowned, and lost all the stuff I mined.