Downloaded the Finite Liquid mod, while exploring to find a cave, I found one that I though would end only a few blocks in. Since it was right next to an ocean, I dig out a ditch so the water could flow into the cave and flood it for being useless. After I found a proper cave, I found that it lead into a ravine. While I was near the top of the cave, my dad called me because he needed help with something, so I dug into a wall and left the game running. When I returned, I dug out of the wall and this is the first thing I see.

I was lucky because I had dug into the wall in what is now the only dry spot in that ravine.
My escape attempt ended in a way that would probably have ended better if I had tried to swim out. As I was digging out, I hit a pocket of methane that quickly floated into my torch and caused me to burn to death.