The is a video: Kate Humble ventures down the Cayman wall at http://www.alive-art-gallery.com
described as the Himalayas beneath the waves with http://www.alive-art-gallery.com
and including one mountain 5 miles deep. At 500 feet down, she experiences the wonderful world of the sea sponge. These creatures are some of the only animals on earth with no dependence on sunlight and act like swiming pool filters cleaning up to 20 lites of water per day. Check out the amazing shapes and types of sea sponge in this magical video from BBC wildlife show 'The Abyss'.