Lava, lava, lava. I do alot of tunneling, falling to death is hard where you're just above bedrock, also i am torch happy so not the mobs, i have yet to drown even once, but holy crap! LAVA!! digging minding my own bussines, Lava on the head. Ok super careful about stuff above now, all of as sudden fall into lava that is 2-3 blocks deep, can't get out... damn! ok watc the top watch the bottom. Boom comes out the side try to run but lava catches up, burn to death because i forgot to bring a water bucket. Man do i hate Lava.