A place of mountain ranges, perpetual night, pressure extremes and cold... and the weirdest life forms on our planet. A true voyage into the unknown with constant surprises in store. Fish with grotesquely cavernous mouths and cruel teeth lurk one kilometre below the surface. Any light is living light, but a glow in the dark may be meant to attract the opposite sex, unless it is the deep-sea angler fish who already has her mate conveniently fused to the end of her nose. On the floor of the ocean deep, all manner of primitive creatures crawl across the ooze.