The SeaBird from AquaVenture goes around underwater towed, with a 400 ft cable attached to a boat on the surface. The advantage of having this for your underwater ride is it goes faster than usual.
According to AquaVenture, the two-passenger SeaBird is capable to dive down to a depth of 150 feet in mere seconds at a top speed of 25 mph, with continuous communication with the towing vessel.
Previous personal submarines have all employed electric engines and electric batteries for energy storage. Such systems require expensive battery banks and motors, all of which add complexity, and of course, cost, while delivering very limited performance. SeaBird does away with all of it by employing the support surface vessel as a towing vessel.
The SeaBird, whose passengers are encased in a plexiglass shell over the ABS steel body that has buoyant and shock resistant capabilities, can steer the SeaBird via a side mounted joystick and rubber control pedals.
Go faster or slower at your request while you maintain the ability to maneuver within a cone behind the towing vessel.