Eureka III delivers four dry metric tons of nodules every 3.8 hours. Eureka IV delivers 12 dry metric tons. The breakdown of the mission time  for Eureka III is as follows:

  1. Launch Eureka from transport vessel to ocean: 1 minute
  2. Dive Eureka to seabed at 4.7km depth: 68.8 minutes
  3. Harvest nodules to fill Eureka payload: 53.1 minutes
  4. Rise Eureka up the 5km water column: 68.8 minutes
  5. Recovery of Eureka from the ocean to the transport vessel using our Smart Launch and Recovery System (SLARS): 4 minutes
  6. In parallel on the vessel: 30 minutes
  7. Unload Eureka payload of nodules to the transport vessel
  8. Eureka battery swapped for fully charged new battery pack
  9. Eureka vehicle maintenance
  10. Download of mission data
  11. Upload of next mission

Total = 255.6 minutes or 3.8 hours

Please also see Question D.4 How do you scale to high production rates?

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