Patent No. EP4308845 (titled "Submersible System For Storing Tanks And Method Of Storing Tanks On A Seabed") was filed by Deep Purple on Mar 17, 2022. The application was issued on Aug 13, 2025.
A subsea system comprises at least one negatively buoyant frame structure for the horizontal storage of positively buoyant tanks. The frame includes at least two side-by-side storage positions on one level, each featuring at least one cradle for bottom support. A fastening device, operating in two states, enables tank installation: a first state permitting top-down positioning into the cradle, and a second state securing the tank radially to prevent vertical upward movement. The system's total submerged buoyancy remains negative when all storage positions are occupied. The system may be modular, allowing stacked frame structures to minimize seabed footprint. Tanks are typically lowered filled with inert gas, later replaceable by hydrogen for energy storage in remote or offshore locations.

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