Knowledge Base

Deep Mooring (4,500m) — Why It Was Eliminated

Final High Research 237 words Created Mar 4, 2026

Deep Mooring (4,500m) — Eliminated

Status: Eliminated (by mobile ship decision)

What It Is

A mooring system to anchor a stationary platform at the GPGP, where ocean depth averages 4,500 meters. Options included taut-leg polyester rope, suction pile anchors in abyssal clay, and thruster-assist hybrid station-keeping.

Estimated cost: $220–440M regardless of platform type — more than any other single cost item in the entire project.

Why It Was Eliminated

The decision to use a mobile processing vessel instead of a stationary platform eliminates the need for mooring entirely. This was one of the strongest arguments for the mobile ship architecture.

Additional reasons mooring was problematic: 1. World record depth is only 2,728m — this would need 65% beyond current capability 2. First-of-kind engineering — no mooring system has ever been deployed at 4,500m 3. Abyssal clay uncertainty — anchor holding capacity at these depths is poorly understood 4. Cost dominance — $220–440M for mooring alone exceeds the entire Phase 1 CAPEX of the mobile ship option 5. Single point of failure — if the mooring fails at 4,500m, the platform drifts with no easy recovery

Under What Conditions It Could Be Revisited

  • Phase 3+ permanent processing hub (if stationary platform concept is revisited)
  • Breakthrough in deepwater mooring technology (e.g., new materials, new anchor designs)
  • Discovery of a shallower location with high plastic concentration

Key Research