Allseas Other service
Polymetallic Nodule Collection (Hidden Gem)
Seabed-to-surface recovery of polymetallic nodules using the Hidden Gem production vessel, a 12 m collector vehicle and a 4.5 km riser.
Description
Allseas developed in-house a system for recovering polymetallic nodules containing nickel, cobalt, copper and manganese from the deep ocean floor. Hidden Gem, described as the world's first deep-sea mineral production vessel, deploys a remotely operated collector vehicle via a launch and recovery system and lifts nodules through a riser via the moon pool.
Key features
- 12-metre remotely operated collector vehicle
- 5000-metre umbilical
- 4.5-kilometre riser through the moon pool
- 2022 pilot tests in the Clarion-Clipperton Zone collected 3000 tonnes of nodules from over 4 kilometres deep
- Independent scientific monitoring of plumes and ecology during trials
Applications
- Deep-sea mineral recovery
Specifications
| Collector vehicle length | 12 m |
|---|---|
| Umbilical | 5000 m |
| Riser | 4.5 km |
| 2022 pilot | 3000 tonnes collected |
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