I was standing, looking down at the ground.  It was covered with all kinds of brightly coloured fish and creatures of the sea.  Most were dead but some, especially the jelly fish were still twitching, showing the final signs of life before giving in.  A voice told me that there was a crack in the continental ice shelf that allowed only sounds in the 8Hz range to pass thru.  Fish used it as a global positioning mechanism, but as soon as that crack split open, the fish would no longer be able to use it and would die.