Almost all remote-controlled subs or remotely-operated vehicles (ROVs) require a cable to provide power, control, and video feeds to the operators. At extreme depths these cables can become too heavy to support from the surface, they can break resulting in the potential loss of the tethered vehicle, and video-based control doesn’t have the same response fidelity as an operator working in three dimensions immediately next to an area of interest. Installing a human pilot inside a submersible allows for easier real-time dynamic navigation, higher visual resolution of targets by the human eye and its inherent peripheral vision, and much easier manipulation of deep-sea samples and equipment.