A port-hole of an immersed structure, for seeing, from inside the structure in air, to the outside of the structure in water, level with the structure, wherein the face of the port-hole oriented toward the inside of the structure includes at least one flat section forming an angle of 20 to 40° with respect to the face of the port-hole oriented toward the outside of the structure.

The present invention refers to a hybrid vessel with a ballast system in which the position of the cabin (102) is changed vertically, from emerged to submerged and vice versa, according to the decision of its operator. Thus, the present invention describes a hybrid vessel with ballast water system comprising at least one cabin (102) and at least one main tank (101) of ballast water, and the tank (101) is connected directly to the CAB (102) or partially above the water level.

The invention relates to a device for viewing underwater objects without getting wet while experiencing the sensation of walking on water. The device comprises an inflated raft with a clear bottom designed to allow a person to sit or lie face down and view underwater objects while experiencing the movement of the water without getting wet. This clear bottom has no air pockets and is flexible, thus the person receives the sensation of walking on water instead of air.

The invention relates to a device for viewing underwater objects without getting wet while experiencing the sensation of walking on water. The device comprises an inflated raft with a clear bottom designed to allow a person to sit or lie face down and view underwater objects while experiencing the movement of the water without getting wet. This clear bottom has no air pockets and is flexible, thus the person receives the sensation of walking on water instead of air.

Various aspects of a watercraft with a controllable imaging device are disclosed herein. The watercraft includes a rotatable housing provided in a recess located underneath the watercraft. The recess further includes a roller assembly to movably engage the rotatable housing within the recess. An imaging device is positioned within the rotatable housing. One or more control commands are received by the imaging device from an electronic device to enable capture of one or more images.

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 floating construction comprising a container filled fully or partially with water, the lower portion of the container being located within a surrounding body of water and the water surface level of the surrounding body of water being substantially lower than the water surface level inside the container, the container comprising transparent walls or walls with transparent sections and at least one open opening for entering the container, which at least one open opening is located below the surface level of the surrounding body of water, and which floating construction comprises space for spectators observing activities taking place inside the container, wherein the floating construction comprises at least one ballast tank, which ballast tank is connected to the container with a controllable pressure connection, and which ballast tank has controllable water connection to the surrounding body of water.

A floating construction comprising a container filled fully or partially with water, the lower portion of the container being located within a surrounding body of water and the water surface level of the surrounding body of water being substantially lower than the water surface level inside the container, the container comprising transparent walls or walls with transparent sections and at least one open opening for entering the container, which at least one open opening is located below the surface level of the surrounding body of water, and which floating construction comprises space for spectators observing activities taking place inside the container, wherein the floating construction comprises at least one ballast tank, which ballast tank is connected to the container with a controllable pressure connection, and which ballast tank has controllable water connection to the surrounding body of water.

This invention is type of dual-purpose boat, including cabin and hull. This boat is unique in that between the cabin and hull there is a lifting mechanism connecting the hull and cabin, at least one of which has been set up with a buoyancy regulating structure. This invention can be used as a regular boat, or if the cabin is lowered, this invention becomes a semi-submerged vessel that can be used for operational purposes or underwater sightseeing. When the invention enters shallow water or needs to navigate at high speed, the cabin can be raised to prevent beaching and to reduce resistance. The operation of this invention is simple and expands the single function of current boats.