A semi-submersible aquatic sports board having a primary load supporting region which is substantially more buoyant and has a greater vertical dimension than other regions of the board. The board may comprise a curved hull, a keel projecting downwardly from the hull and a deck positioned on an upper surface of the hull for supporting a rider in the primary load supporting region. In one embodiment the board may be propelled by a rider supported on the deck in a prone position by using motions similar to natural swimming strokes. The rider can initiate pivoting motion of the board about an axis aligned with the primary load supporting region to aid in self- propulsion. Optionally tail accessories, such as fins, can be coupled to a stern end of the keel and/or hull. At a narrow forward end of the hull the board may include opposed side rails having a pronounced upward curve which merge at a nose at the bow end. The rails may define a viewing opening therebetween.

There is provided a system for towed underwater recreational sightseeing. The system comprises a towed submersible; a tow vessel; a docking station mechanically fastened to the tow vessel via a linkage, the docking station comprising a docking bay adapted for docking the submersible in use, the docking bay configurable between a docked configuration and a deployable configuration, wherein, in the docked configuration, the submersible is raised so as to be poised for boarding by passengers and wherein in the deployed configuration, the submersible is lowered for deployment in water; and a tow cable coupling the towed submersible and at least one of the docking station and tow vessel wherein, once the submersible has been deployed by the docking station in use, the tow cable is adapted for reeling out to locate the towed submersible a suitable distance from the docking station for the completion of a series of underwater manoeuvres under tow of the tow vessel and the reeling in after the completion of the underwater manoeuvres for docking of the docking bay.

There is provided a system for towed underwater recreational sightseeing. The system comprises a towed submersible; a tow vessel; a docking station mechanically fastened to the tow vessel via a linkage, the docking station comprising a docking bay adapted for docking the submersible in use, the docking bay configurable between a docked configuration and a deployable configuration, wherein, in the docked configuration, the submersible is raised so as to be poised for boarding by passengers and wherein in the deployed configuration, the submersible is lowered for deployment in water; and a tow cable coupling the towed submersible and at least one of the docking station and tow vessel wherein, once the submersible has been deployed by the docking station in use, the tow cable is adapted for reeling out to locate the towed submersible a suitable distance from the docking station for the completion of a series of underwater manoeuvres under tow of the tow vessel and the reeling in after the completion of the underwater manoeuvres for docking of the docking bay.

Use: in building of light, predominantly individual sports and tourist floating craft. Essence of the invention: the display on the surface of the swimming board or surfboard broadcasts the information received both from video cameras located either on the surface of the floating craft or on the supports or pulled in tow under the water, and from external mobile and other devices. The display is configured to stabilize the displayed image and compensate effects caused by water refraction coefficient, and has the ability of creating animated graphic marks and tips to facilitate user's balancing on the floating craft.

Use: in building of light, predominantly individual sports and tourist floating craft. Essence of the invention: the display on the surface of the swimming board or surfboard broadcasts the information received both from video cameras located either on the surface of the floating craft or on the supports or pulled in tow under the water, and from external mobile and other devices. The display is configured to stabilize the displayed image and compensate effects caused by water refraction coefficient, and has the ability of creating animated graphic marks and tips to facilitate user's balancing on the floating craft.

An underwater data center includes an electronic device; a housing member that houses the electronic device and that is configured to be disposed under water; and a heat exchanger that is provided at the housing member and that is configured to discharge, into the water, heat discharged from the electronic device, with a face of the heat exchanger that discharges the heat making contact with the water, an opening being formed in a bottom face of the housing member and placing an inside of the housing member in communication with the water.

A water window apparatus including a main water window element, and a plurality of retaining flanges, along with interlocking teeth that fixedly communicate with one another to fixedly retain the main water window there between. The main water window is hollow, as well as monolithic and hermetically sealed to maintain its integral buoyancy, and further has a top that includes a magnifying element that imparts magnification when viewed therethrough.

A water window apparatus including a main water window element, and a plurality of retaining flanges, along with interlocking teeth that fixedly communicate with one another to fixedly retain the main water window there between. The main water window is hollow, as well as monolithic and hermetically sealed to maintain its integral buoyancy, and further has a top that includes a magnifying element that imparts magnification when viewed therethrough.

A floating construction comprising a water space within the floating construction, which water space has transparent walls and/or walls containing transparent sections, and at least one open opening allowing water surrounding the floating construction to enter into the water space, and the floating construction comprising space next to the water space for spectators observing the activities taking place inside the water space, wherein the floating construction comprises a draft control system for changing water surface level inside the water space.

A floating construction comprising a water space within the floating construction, which water space has transparent walls and/or walls containing transparent sections, and at least one open opening allowing water surrounding the floating construction to enter into the water space, and the floating construction comprising space next to the water space for spectators observing the activities taking place inside the water space, wherein the floating construction comprises a draft control system for changing water surface level inside the water space.