Patent ID: 8517635

Claim:
A floatability device designed for any submersible entity, capable of being immersed to different depths, and comprising at least one float with a supple membrane filled with gas, and a pressure of said gas is regulated as a function of an immersion depth, wherein: said membrane is elastic and delimits a space which has a volume which is a function of an elasticity of said membrane and of a relative internal pressure of said space in relation to an external ambient pressure, an expander-discharge system automatically feeds and purges gas to or from said space without intervention from said entity to maintain a preselected volume of said space over a range of depths at which the floatability device is immersed, wherein said relative internal pressure of said space is regulated to be higher than said external ambient pressure so that a pressure differential therebetween is maintained at a constant value that is selectable by said entity, and wherein said preselected volume is adjustable by said entity.