An adjustable flow of fresh air is forced into the cabin and the used air with carbon dioxide is dumped outboard keeping the inside with normal rates of oxygen. The fresh air flow rate is 3 times the volume of air inhaled by the passengers. Breathing air under pressure , operating a Seahorse follows the same scuba diving tables, at the difference that passengers are at rest and in a dry environment. To make the dives easy and safe a dive computer indicates the pilot all necessary parameters, depth, bottom time, time to surface. Ballasts arrangement and hull architecture provide high stability with impossibility to flip over.
Air pressure is used to blow the ballast to surface the submarine.
To reduce air consumption, to have an alternate source of air and to be able to dive right below the surface at periscope depth in snorkeling mode, a snorkel with a compressor feeds the cockpit with fresh air from outside instead from the tanks. Buoyancy is set by a buoyancy tank and controlled with a thumb switch on the control grip, buoyancy can be adjusted to neutral and smooth ascents or descents can be performed like a fish does with its bladder, preventing the engines thrust from blowing away sand and sediments all around the sub when approaching the sea floor. At intermediate depths, the pilot uses an aircraft type control stick with steering cables to action engines, compensated dive plan and rudder. The dashboard displays all necessary parameters, depth, air and battery capacity, sonars, dive profile, buoyancy and a video screen. The optional gas or diesel engine allows fast surface and snorkel transits.