One solution. Anything that works on the seafloor.
Every industry moving and operating plant and equipment on the seafloor at extreme depth faces the same challenge: how do we service and maintain it?
Desalination is going deep.
Developers are moving reverse osmosis to the seafloor, and they’ve published the case for it.
Why depth, in the developers’ own numbers
Up to 50% less energy than land-based reverse osmosis.
Flocean
Around 80% less coastal land than a land-based plant.
Waterise
Discharge only about 5% saltier than the surrounding sea, and no pre-treatment chemicals.
OceanWell
The category so far
Flocean Zero producing
at ~500 m off MongstadJun 2025
Flocean launches first
commercial subsea plantAug 2025
OceanWell Water Farm 1:
six agencies joinJun 2026
First drinkable water from
a commercial-scale plant2030
Water Farm 1 target:
up to 60M gallons a day
Flocean, Jun 2025; Business Wire, Jun 2026; OceanWell, Aug 2025
The supply chain has arrived.
The resource is on the seafloor. Process it there.
Collection and processing equipment on the seabed faces the same servicing bill as a desal plant, far from port. A platform that brings modules home for service keeps the fleet working without a vessel on station.
Subsea processing moves topside plant to the wellhead.
Subsea separation, boosting and compression already sit on the seabed. Interventions still mean vessels and crews. Modules that return on their own turn those interventions into routine land-based work.
Cold, stable water is a heat sink that never switches off.
Subsea compute and cooling modules need hardware refreshes and repairs on a schedule. Bringing a module up, swapping in a spare and servicing it on land keeps uptime high without an offshore campaign.
Seabed deposits, worked by seabed equipment.
Southern Africa’s west coast has worked marine deposits for decades. Seabed crawlers and processing gear come back for service without tying up a mining vessel.
If it goes down, it should come up.
Working on seafloor equipment in another sector? We’d like to hear about it.
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