Affordable Autonomous Robots Are Transforming Deep-Sea Exploration

The U.S. National Oceanic and Atmospheric Administration (NOAA) has deployed two autonomous underwater vehicles (AUVs) to map more than 8,000 square nautical miles of the Pacific seafloor. The mission, conducted by the research vessel Rainier, aims to identify critical mineral deposits in a region situated between Australia and South America.

The submersibles were developed by Orpheus Ocean, a company that spun off from the Woods Hole Oceanographic Institution (WHOI) in 2024. These neon-colored vehicles are designed to descend nearly 6,000 meters to explore the seafloor and collect samples of sediment and metal nodules containing copper, cobalt, nickel and manganese.

Low-Cost Deep-Sea Exploration

Orpheus Ocean is attempting to disrupt the economics of deep-sea research. According to Jake Russell, cofounder and CEO of Orpheus, the company operates under a philosophy of deep for cheap. While traditional deep-sea exploration vehicles can cost between $5 million and $10 million, the Orpheus vehicles cost a couple of hundred thousand dollars each to build.

The vehicles are among the smallest on the market capable of reaching 6,000 meters, measuring less than two meters in length and weighing under 600 pounds (270 kilograms). Their construction utilizes syntactic foam—a buoyant material containing hollow glass microspheres to resist extreme pressure—and a thick glass sphere to protect internal electronics.

Unlike many AUVs designed for high-speed gliding, the Orpheus submersibles are built for stability and interaction with the seafloor. They are capable of making soft landings and using a hopping motion to move across the substrate. This design allows them to push into the seafloor to capture sediment cores and biological samples.

Technical Capabilities and Testing

The current expedition represents the most significant test for the submersibles to date. While previous prototypes were rated for depths of 11,000 meters—the depth of the Mariana Trench—this mission tests their ability to operate over large ranges for several weeks with multiple instruments.

Operating from the Rainier, the vehicles swim in 10-kilometer increments. Their data collection protocol includes taking one high-resolution image every second and collecting up to eight physical samples from the seafloor per vehicle.

The technology has already seen limited application. In the spring of 2024, Victoria Orphan, a geobiologist at the California Institute of Technology, used an Orpheus vehicle to map deep-sea methane seeps off the coast of Alaska’s Aleutian Islands. This mapping was intended to guide the deployment of the human-crewed submersible Alvin.

There’s a lot of real, unknown science right at that interface between the sediment and the ocean surface. The Orpheus-type class of instrument, with the right kinds of sensors and samplers, could be a very enabling tool.

Victoria Orphan, geobiologist at the California Institute of Technology

Implications for Science and Industry

The accessibility of these lower-cost vehicles may change how deep-sea research is conducted. Andrew Sweetman, a deep-sea ecologist at the Scottish Association for Marine Science, noted that the small size of the vessels eliminates the need for massive research ships, which could democratize deep-sea science for smaller or less wealthy nations.

However, the technology also attracts commercial interest. Russell reported weekly inquiries from sectors including defense, telecommunications, oil and gas, offshore wind, and deep-sea mining. Orpheus describes itself as a service provider that collects data rather than a decision-maker regarding seafloor usage.

The timing of this technological advance coincides with a shift in U.S. Policy. Last week, President Donald Trump issued an executive order mandating that the U.S. Government rapidly develop mineral exploration and processing. The administration recently announced the creation of the Marine Minerals Administration.

The prospect of industrial mining has drawn warnings from the scientific community. Geobiologists and ecologists argue that deep-sea environments are highly stable and that organisms living Notice not adapted to disturbance, making recovery from mining activities slow or impossible.

Brett Hobson, an ocean engineer at the Monterey Bay Aquarium Research Institute (MBARI), suggested that AUVs like those from Orpheus could provide a more surgical alternative to the bulldozer method of mining, which involves trawling the seafloor and creating sediment plumes.

Similar deep-sea vehicle development is currently underway in the United Kingdom, France, Japan, China, and Norway, reflecting a global increase in the effort to map the planet’s least-explored regions.