an Entity references as follows:
DeepFlight Merlin is a personal submarine by Hawkes Ocean Technologies, part of the DeepFlight line of submersibles. The positively buoyant submersible was designed by Graham Hawkes. The Merlin was the first winged open-cockpit submarine (a wet sub) available on the market, and first three-man submarine in the "aero submarine" class, representing a major advance in scuba diving technology.