A submersible pen system 100 for aquaculture with collar 1 circumferentially arranged around a hub 4. The hub and/or collar has a variable buoyancy. A net panel 6 provides surfaces to define the pen and is coupled to the collar and at least one tensioning element 5. A stabilising diaphragm 50 is coupled to the hub and the collar and is at least partially deformable to provide a stabilising force between the hub and the collar. The diaphragm 50 may have panels 2 and resilient structures 3. A deformation of the diaphragm effects a degree of movement in the collar with respect to the hub when exposed to external dynamic loading. The stabilising diaphragm may be a elastomeric spring or an integral heave spring to allow stable proportional movement in response to ballast changes. Buoyancy may be controlled remotely. The hub may be coupled to an anchor C via a mount 7. The pen may be used offshore.
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