Vessel-mounted drilling rigs for offshore site investigation, seabed sampling and CPT testing. Two production builds (GMTR 120 and GMTR 150), delivered on three vessels.
Both rigs share a modular skid platform with active motion compensation, integrated sample handling and hydraulic power and control modules. Choose by rig class: a single-tower 120 MT build or a twin-tower 150 MT build.
Single-tower, 120 MT class. Delivered on the Dina Polaris and Greatship Ragini.
Twin-tower, 150 MT class with 6 m compensator rams and full pipe handling.
| Parameter | GMTR 120 | GMTR 150 |
|---|---|---|
| Rig class | 120 MT | 150 MT |
| Configuration | Single-tower skid | Twin-tower skid |
| Sub-seabed penetration | Up to 200 m | Up to 200 m |
| Water depth range | Surface – 3,000 m | Surface – 3,000 m |
| Sample diameter | 76 / 100 / 150 mm | 76 / 100 / 150 mm |
| Heave compensation | Active, ± 2.5 m stroke | 6 m compensator rams (active) |
| Rotary drive | 20,000 Nm top drive | 150 MT power swivel |
| Pipe handling | — | Crane, racks, iron roughneck |
| Mass | ≈ 120 t | — |
| Delivered on | Dina Polaris, Greatship Ragini | FUKADA POSEIDON-1 |
The entry build in the GMTR family. Delivered for the Dina Polaris and the Greatship Ragini for deepwater seabed sampling and CPT campaigns, it mobilises onto a vessel of opportunity as a modular skid.
| Class | 120 MT |
|---|---|
| Configuration | Single-tower, vessel-mounted skid |
| Sub-seabed penetration | Up to 200 m |
| Water depth range | Surface – 3,000 m |
| Drilling method | Wireline, top-drive, casing advance |
| Sample diameter | 76 mm / 100 mm / 150 mm |
| Sample type | Push, percussion, rotary, CPT |
| Heave compensation | Active, ± 2.5 m stroke |
| Rotary top drive | 20,000 Nm peak torque |
| Mobilisation | < 5 days, vessel-of-opportunity |
| Vessels delivered | Dina Polaris · Greatship Ragini |
| Mass | ≈ 120 t |
The larger sibling to the GMTR 120, delivered for the FUKADA POSEIDON-1. It is sized for high-throughput offshore wind and platform-foundation site investigation, with a complete pipe-handling and umbilical-winch package around twin towers.
| Rig class | 150 MT |
|---|---|
| Configuration | Twin-tower, vessel-mounted skid |
| Compensator | 6 m compensator rams (active) |
| Power swivel | 150 MT class |
| Sub-seabed penetration | Up to 200 m |
| Water depth range | Surface – 3,000 m |
| Drilling method | Wireline, top-drive, casing advance |
| Sample diameter | 76 mm / 100 mm / 150 mm |
| Sample type | Push, percussion, rotary, CPT |
| Sample handling | Tools and Sample Handling Winches integrated |
| Auxiliary winches | CPT & SBF Umbilical Winches · SBF Traction Winches |
| Compensation | SBF Compensation System |
| Pipe handling | Pipe Handling Crane · Drill Pipe Racks · Iron Roughneck |
| Power & control | Hydraulics Power Pack & Control Modules · Project Containers |
| Vessel | FUKADA POSEIDON-1 |
| Mobilisation | Modular skid, vessel-of-opportunity ready |
| Classification | DNV / BV — project-specific |
Engineered and fabricated in Singapore, with FAT and offshore commissioning delivered by the Dimension team.
Vessel-mounted skid and project-container layout, ready on a vessel of opportunity in under 5 days.
Active motion compensation holds the drill string steady for accurate seabed sampling.
Compatible with PCPT, T-bar and push, percussion, rotary and CPT sampling.
Sample-handling winches plus an integrated sample preservation and logging cabin.
Hydraulics Power Pack & Control Modules with full PLC supervision.
Both builds share the same controls, so operators move between rigs without retraining.
Dimension carried both rig platforms from engineering and fabrication through FAT to offshore commissioning. The GMTR 120 mobilised onto the Dina Polaris and Greatship Ragini for deepwater sampling; the GMTR 150 went onto the FUKADA POSEIDON-1 for offshore wind and platform-foundation site investigation.
In the press, 1 May 2026: Geoquip Marine’s Dina Polaris, the world’s largest geotechnical drilling vessel, fitted with the GMTR 120 and converted with the Geoquip team in Türkiye, is mobilising to the Americas. Read in News →
From feasibility through commissioning — Dimension delivers in-house engineered marine equipment, backed by 14+ years of offshore operations.
