An underwater motive device includes a rear main housing including two opposite handle bar elements on two sides respectively, and longitudinal rear joining projections on an inner surface; a power mechanism in the rear main housing; a propeller driven by a driving shaft of the power mechanism; a bridging housing including a battery compartment, a forward joining member, a shoulder abutted the forward joining member, and a rear joining member; a hollow intermediate housing including two opposite handle bar members on two sides respectively, the handle bar members joined the handle bar elements, longitudinal front joining projections on an inner surface, and an internal annular limit element at a front end; and a front cone including a rear opening and a structure on an inner surface for securing to the forward joining member of the bridging housing.

An underwater motive device includes a rear main housing including two opposite handle bar elements on two sides respectively, and longitudinal rear joining projections on an inner surface; a power mechanism in the rear main housing; a propeller driven by a driving shaft of the power mechanism; a bridging housing including a battery compartment, a forward joining member, a shoulder abutted the forward joining member, and a rear joining member; a hollow intermediate housing including two opposite handle bar members on two sides respectively, the handle bar members joined the handle bar elements, longitudinal front joining projections on an inner surface, and an internal annular limit element at a front end; and a front cone including a rear opening and a structure on an inner surface for securing to the forward joining member of the bridging housing.

A multipurpose watercraft has a pair of catamaran pontoons supported by way of a transverse control bar at forward regions thereof. The watercraft may have an arched equipment rack framework extending above rearward regions of the pontoons. The watercraft also has a pair of electric motor thrusters located respectively beneath each pontoon and the control bar comprises a pair of controls operable by hand, each control operable to control a respective thruster forwards or backwards. Alternatively, the thrusters may be remotely controlled. This configuration allows an operator to be pulled behind the control bar horizontally between the pontoons, snorkellers to be pulled behind the watercraft for recreational sightseeing and/or for remote-control rescue operations.

A multipurpose watercraft has a pair of catamaran pontoons supported by way of a transverse control bar at forward regions thereof. The watercraft may have an arched equipment rack framework extending above rearward regions of the pontoons. The watercraft also has a pair of electric motor thrusters located respectively beneath each pontoon and the control bar comprises a pair of controls operable by hand, each control operable to control a respective thruster forwards or backwards. Alternatively, the thrusters may be remotely controlled. This configuration allows an operator to be pulled behind the control bar horizontally between the pontoons, snorkellers to be pulled behind the watercraft for recreational sightseeing and/or for remote-control rescue operations.

The invention relates to a water board (2) made of a material that can float on water, having a support area (8), on which a user rests at least partially. To reduce the current forces acting on the user while holding on to and being towed behind a motorized watercraft (24), it is proposed that the water board (2) has, at a front-end area, an attachment segment (22) for the articulation of the water board (2) to the watercraft (24).

A subsurface diver transport vehicle includes a vehicle body and at least one propulsion device. The vehicle body incorporates a number of individual mission modules mechanically assembled together to define a substantially continuous hull and deck of the vehicle. The mission modules include at least one battery module adapted for supplying electrical current to electrical subsystems of the vehicle. The propulsion device is attached to the vehicle body and capable of propelling the vehicle through a body of water.

A subsurface diver transport vehicle includes a vehicle body and at least one propulsion device. The vehicle body incorporates a number of individual mission modules mechanically assembled together to define a substantially continuous hull and deck of the vehicle. The mission modules include at least one battery module adapted for supplying electrical current to electrical subsystems of the vehicle. The propulsion device is attached to the vehicle body and capable of propelling the vehicle through a body of water.

An underwater propulsion device is disclosed comprising two sleeves for fitting around each of a user's lower legs, with each sleeve mounting a propulsion unit, and the sleeves being connectable by a bar between them during underwater operation of the device by the user.

An underwater propulsion device is disclosed comprising two sleeves for fitting around each of a user's lower legs, with each sleeve mounting a propulsion unit, and the sleeves being connectable by a bar between them during underwater operation of the device by the user.