Patent ID: 9725918
Date: 2017-08-08
CPC Classifications: B63B,E04H,Y02A

Claim:
1. An arrangement for underwater activities comprising a reservoir, which reservoir comprises at least one wall and at least one opening for entering the reservoir, wherein the reservoir is configured to be filled fully or partially with water, wherein the arrangement comprises additionally a container to be filled at least partially with water, wherein said container is configured to receive said reservoir so that the lower portion of the reservoir comprising at least one opening is to be located under the surface level of the body of water in said container, wherein said lower portion of the reservoir when introduced within the container is configured to form together with the container's wall an upper portion of the container, which upper portion is configured to support via said opening of the reservoir's lower portion the pressure difference between said upper portion of said container and the space inside the reservoir, when water is introduced inside the reservoir.