Abstract: A watertight suit is capable of properly discharging air within the suit and safely maintaining a diver's position in the water. The suit includes an air outlet valve provided in an end section of a leg part, the air outlet valve functioning to discharge air from the inside of the leg part. Another air outlet valve can also be provided in an upper body part of the suit. An air inlet introduces air into the watertight suit as necessary to equalize external pressure. Where an automatic air outlet valve is provided, air in excess of external pressure is vented through the outlet valves automatically as warranted by the diving conditions, keeping an even balance of pressure even when air is excessively supplied form the air source through the inlet valve.

Abstract: An aquascooter apparatus including a controller for preventing problems associated with water leakage into the aquascooter. The aquascooter has a battery, a driving motor and a clutch in a housing, and the controller includes a water leak detecting sensor that detects a leakage of water into the housing. A motor control is responsive to the signal from the water leak detecting sensor, and prevents the battery from supplying electric power to the driving motor responsive to this signal. This prevents electrical energy from being used if a water leak is detected, and therefore prevents any possibility of a dangerous situation of a spark in contact with hydrogen gas.