Underwater Creature

Since at such deep levels, there is little to no sunlight, photosynthesis is impossible as a means energy production, leaving some creatures with the quandary how to produce food for themselves. For the giant tube worm, this answer comes in the form bacteria that live inside it. These bacteria are capable chemosynthesis and live inside the giant tube worm, which lives on hydrothermal vents. These vents spew very high amounts chemicals that these bacteria can transform into energy. These bacteria can also grow freely a host and create mats bacteria on the sea floor around hydrothermal vents, where they serve as food to other creatures. Bacteria are a key energy source in the food chain. This source energy creates large populations in areas around hydrothermal vents, which provides scientists an easy stop for research.
Deep Sea Research
Humans have explored less than 2% the ocean floor, and dozens new species deep sea creatures are discovered with every dive. The submarine DSV Alvin—owned by the US Navy and operated by the Woods Hole Oceanographic Institution (WHOI) in Woods Hole, Massachusetts—exemplifies the type craft used to explore deep water. This 16 ton submarine can withstand extreme pressure and is easily maneuverable despite its weight and size.