| 摘要 |
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. |
