Knowledge Base

Stationary Platform — Why It Was Eliminated

Final High Research 303 words Created Mar 3, 2026

Stationary Platform — Eliminated

Status: Eliminated

What It Is

A fixed or semi-submersible platform anchored at the GPGP, similar to an offshore oil rig or FPSO (Floating Production Storage Offloading vessel). Plastic would be collected by a fleet of smaller vessels and brought to the platform for processing.

This was the original concept for The Claw before the mobile ship architecture was chosen.

Why It Was Eliminated

1. Mooring cost — anchoring at 4,500m depth (GPGP average) would cost $220–440M for the mooring system alone. Current world record is 2,728m — this would need to go 65% beyond that. 2. Can't follow the debris — GPGP plastic concentration varies seasonally and shifts with currents. A fixed platform sits in one spot while the plastic moves away. 3. Collection fleet required — needs 5–10+ collection vessels to bring plastic to the platform, adding $50–100M+ CAPEX and complex logistics. 4. Higher total CAPEX — $480–1,130M (platform + mooring + collection fleet) vs. $163–410M for a mobile ship. 5. No proven mooring at this depth — would be first-of-kind engineering at 4,500m, adding years of development time and risk. 6. Slower plastic collection — a stationary platform sweeps only the water that passes by. A mobile ship sweeps 6–10x more area by actively seeking debris.

The mobile ship won 9 of 13 comparison categories in the platform type analysis.

Under What Conditions It Could Be Revisited

  • Phase 3+ as a permanent processing hub, receiving plastic from a fleet of mobile collection ships
  • If a location is found with consistently high plastic concentration that doesn't shift
  • If mooring technology advances to make 4,500m depths routine and affordable

Key Research