Buoyancy body for submerged loads

摘要

The buoyancy body has at least one container which can be filled and emptied. There is a pump (3) to fill the container (2). The pump creates negative pressure, which operates against the external pressure. The pump may be fitted to the container. A power cable may run to the surface of the water, to power the pump. Alternatively, there may be a generator on the buoyancy body or on the load being lifted, to power the pump. The pump may be usable both for filling and emptying the container. The container may have a valve for emptying it. The load may be an object to be immersed, or an underwater platform.