Subsea storage system, wherein said system comprises a protection structure (2) providing a first closed volume (7) with at least one first fluid opening (19) connectable to a first fluid pipeline for fluid communication between the first closed volume and the first fluid pipeline, two or more flexible storage bags (18, 18') arranged within the first closed volume and each comprising at least one opening connected to a second fluid conduit (17, 17") for fluid communication between the flexible storage bag and the second fluid conduit wherein the second fluid conduit passes through the protection structure and a first fluid pressure management system for managing a first fluid pressure within the protection structure and a method for filling and emptying thereof.
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