Abstract: 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.

Abstract: 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.

Abstract: An arrangement (100) for underwater activities includes a reservoir (101), which reservoir includes a wall (102) securing a space inside the reservoir (101) to be filled at least partially with water (103). The arrangement has also an opening (104a, 104b) for entering the reservoir, and a container (105) to be filled at least partially with water (103). The container receives the reservoir (101) so that the lower portion of the reservoir including at least one opening (104a) is located under the water surface level (103). The lower portion of the reservoir when introduced with the container is securing together with the container's (105) wall an upper portion (107) of the container, which upper portion (107) supports via the opening (104a) the pressure difference between the upper portion (107) of the container (105) and the space inside the reservoir (101), when water (103) is introduced into the space inside the reservoir.

Abstract: A method and an apparatus (1, 11, 21, 31) for moving one or more loads (5, 15, 25, 35a, 35b,45), in which method loads are moved along a channel (2, 12, 22, 32a, 32b, 49, 49?) on or in fluid, wherein the channel (2, 12, 22, 32a, 32b, 49, 49?) extending substantially horizontally in lengthwise direction has a cross-section, which cross-section defines an open section (13, 33a, 33b) and a closed section (14, 34a, 34b), wherein the fluid in the open section is directly in contact with surrounding air, and the fluid in the channel can flow from the open section to the closed section and vice versa through opening or openings located below the surface level of the fluid in the open section, and the load or loads (5, 15, 25, 35a, 35b, 45) are moved by floating them at least partially inside the closed section.

Abstract: A floating construction (1, 11) includes a vessel (2, 12) partially or fully filled with water and with transparent walls or with walls including transparent sections, and space (3, 5, 6) provided around or partially around the vessel, where the vessel includes at least one opening allowing the surrounding water to enter into the vessel, wherein the space (3, 5, 6) provided around the vessel (2, 12) is enclosed to provide interior observation area for activities taking place inside the vessel.

Abstract: An arrangement for underwater activities comprises at least two spaces arranged one on the other thereby forming a multilayer structure, where at least one space is configured to be filled by the water for water activity. In addition the arrangement comprises a room for spectators. Each of said spaces comprises at least one wall and layer forming together said space. The first space comprises a first set of activity means for underwater activity, and the second space comprises a second set of activity means for activity. At least portion of said walls and/or layers are transparent. In addition the room for spectators is arranged in connection with said spaces and separated from the space by the wall and/or layer structure.

Abstract: An apparatus for underwater activities including a vessel filled fully or partially with water, which vessel includes one or more open openings for entering the vessel, wherein the lower portion of the vessel is located within a body of water, all of the one or more open opening for entering the vessel are located in that portion of the vessel which is located under the surface level of the body of water, and that walls of the vessel are transparent, or the walls include sections that are transparent, for allowing observation of the activities taking place inside the vessel from outside of the vessel.

Abstract: A method and an apparatus for lifting a mass of water with a container from a larger body of water, in which method the container having at least one open opening is first located below the surface level of the larger body of water and the container is full of water, wherein the container is raised partially above the surface level of the water by elements attached to the container, and that the at least one open opening of the container is located below the surface level of the larger body of water during and after raising of the container thus lifting the mass of water located inside the raised portion of container above the surface level of the larger body of water.