As the world turns its attention to Nice for the upcoming 3rd United Nations Ocean Conference (UNOC-3), a spotlight is being placed on tangible, scalable solutions that can help preserve marine ecosystems while enabling sustainable use of ocean resources. In this context, Deep Ocean Search (DOS) has announced the launch of its newest innovation: the Mariner XL, a 6,000-meter-rated Remotely Operated Vehicle (ROV) designed to transform deepwater inspection, sampling, and recovery operations.
Compact Power for Ultra-Deepwater Tasks
Developed in partnership with Marine Operations London LTD, the Mariner XL redefines what it means to deploy a Work-Class ROV (WROV) at extreme depths. With a maximum operating depth of 6,000 meters and a compact system that fits into just four 20-foot containers, the Mariner XL offers quick and simplified mobilization anywhere in the world—without requiring structural changes to support vessels.
In a press release, Nicolas Vincent, Chief Operating Officer at DOS stated:
“We are thrilled to introduce the Mariner XL as the latest generation of deepwater ROV. It reflects our core values: technical excellence, teamwork, and global readiness.”
Its all-electric propulsion, dedicated HPU for manipulators, and advanced inertial/acoustic positioning make the Mariner XL ideal for a wide range of sectors—from offshore oil & gas and marine renewables to scientific research, mineral sampling, and defense.
This new ROV is engineered for more than performance—it’s also built for sustainability. Its lightweight, modular design lowers mobilization costs and reduces the demands placed on support vessels, thereby minimizing operational carbon footprints—an essential consideration as the maritime industry faces growing environmental scrutiny.
Technical Highlights
- Dimensions: 2.86 x 1.70 x 1.70 m
- Weight: 3,300 kg
- Payload: 200 kg
- Thrust: Up to 275 kg axial, 260 kg vertical
- Speed: 3 knots axial, 1.5 knots vertical
- HD camera, multiple manipulators, and high-spec INS/DVL navigation
- Advanced bathymetric sensors, including the Valeport VA500
From surveying subsea infrastructure to conducting precision metrology and debris field investigations, the Mariner XL delivers. Its dynamic positioning capabilities throughout the water column and tooling flexibility make it well-suited for both routine and specialized missions.
Built for Global Deployment
Expected to be available by summer 2025, the Mariner XL builds on DOS’s two decades of experience in deep-sea operations. The company has a track record of pioneering firsts, including the development of the first full-depth side-scan sonar (11,000m) and the integration of geotechnical tools on autonomous 78-meter vessels. The Mariner XL continues that legacy.
The Mariner XL is being introduced as part of DOS’s presence at UNOC-3, taking place June 9–13, 2025. By delivering advanced yet eco-conscious underwater technology, DOS supports SDG 14, the UN’s sustainable development goal focused on life below water.
