by kingmudsy

As we swam deeper and deeper into the [ice]berg, there were also strange cracks and pops and groans from the ice. It was moving, it was shifting, it was changing. And I remember at one point a very deep groaning vibration sounded. And I felt it all the way through to my toes. It was that loud...[And] when we finally turned around on that dive and worked our way back slowly to the entrance, there were big, giant pieces of ice where we had entered this cave. And the doorway we swam into was gone.