A retriever system for retrieving a marine equipment, said retriever system comprising: - a hollow body having a first opening, - a cap adapted to close the first opening of the hollow body and adapted to be removed to free said first opening, - a buoyancy assembly housed in the hollow body and adapted to exit the hollow body when the cap is removed, - a linkage system to maintain the buoyancy assembly linked to the hollow body of the retriever system, when said buoyancy assembly is out of said hollow body of the retriever system, wherein said buoyancy assembly comprises: - a first inflatable element and a second inflatable element, - an inflating system configured to, when activated, inflate the first inflatable element, so as to enable exiting of at least the second inflatable element of the buoyancy assembly out of the hollow body, said inflating system being configured to start or to continue inflating the second inflatable element when said second inflatable element is out of the hollow body, and wherein the inflating system comprises an inflating generator and an activation system (51, 52) to activate the inflating generator to provide the first inflatable element with gas; characterised in that the inflating system further comprises: a valve mechanism that is configured to: - prevent inflating of the second inflatable element while said second inflatable element extends inside the hollow body, and - enable said inflating of the second inflatable element after the second inflatable element has exited the hollow body. - a hollow body having a first opening, - a cap adapted to close the first opening of the hollow body and adapted to be removed to free said first opening, - a buoyancy assembly housed in the hollow body and adapted to exit the hollow body when the cap is removed, - a linkage system to maintain the buoyancy assembly linked to the hollow body of the retriever system, when said buoyancy assembly is out of said hollow body of the retriever system, wherein said buoyancy assembly comprises: - a first inflatable element and a second inflatable element, - an inflating system configured to, when activated, inflate the first inflatable element, so as to enable exiting of at least the second inflatable element of the buoyancy assembly out of the hollow body, - a first inflatable element and a second inflatable element, - an inflating system configured to, when activated, inflate the first inflatable element, so as to enable exiting of at least the second inflatable element of the buoyancy assembly out of the hollow body, said inflating system being configured to start or to continue inflating the second inflatable element when said second inflatable element is out of the hollow body, and wherein the inflating system comprises an inflating generator and an activation system (51, 52) to activate the inflating generator to provide the first inflatable element with gas; characterised in that the inflating system further comprises: a valve mechanism that is configured to: - prevent inflating of the second inflatable element while said second inflatable element extends inside the hollow body, and - enable said inflating of the second inflatable element after the second inflatable element has exited the hollow body. - prevent inflating of the second inflatable element while said second inflatable element extends inside the hollow body, and - enable said inflating of the second inflatable element after the second inflatable element has exited the hollow body.