 Have you ever been in a cave? Have you ever been in a place where it was just pitch black? When I went on a mission trip to the Philippines a few years ago, we did a one-day excursion and we went on a boat trip to this cave on the China Sea. And deep into the bowels of this cave is filled with bats. You couldn't go in there except at certain times because you didn't want to be on the boat when the bats were coming out.