The carnivorous "death-ball' sponge. ROV SuBastian/Schmidt Ocean Institute Sea creatures have adapted to help them thrive in extreme environments. Unusual features allow them to live thousands of feet below the surface. Underwater robots give researchers a glimpse at some of these elusive, fascinating animals. Ghosts, goblins, spiders, and wolves don't just show up in fairytales. Some deep-sea creatures are named after frightening or mythical creatures thanks to their eerie appearances. How...