The deep sea is home to weird and wonderful creatures that, over millions of years, have evolved specific traits to survive the extreme conditions of their habitat. These adaptations to their environment have resulted in some truly alien-looking animals.
Scientists define the deep sea as encompassing all ocean waters below 656 feet (200 meters). In these regions, sunlight filtering through the water from above begins to dwindle, giving way to a realm of complete darkness, frigid temperatures and crushing pressure.
