Industries
Robots in the ocean
The only place in the world where physics hands down the verdict for us.
Updated July 2026
Use cases
Surface science and climate
Fleets of robot sailboats spending months collecting weather, fisheries and climate data where no crewed ship wants to be: from a hurricane's eye to the Antarctic ice edge. Real autonomy, because continuous teleoperation is physically impossible.
Seabed work and inspection
ROVs tied to an umbilical with a human pilot to repair cables, inspect platforms and explore wrecks; free AUVs mapping in patient passes. The choice between cable and freedom is the founding decision of every underwater mission.
Amplified human presence
Haptic avatars like OceanOneK, carrying a pilot's sight and touch to depths that would kill a diver. Teleoperation worn proudly: the merit is not that the machine decides, but that the human reaches.
Now this I like: here the robots already earn their keep.
Physics as referee: cable, solitude or surface
On land we devote an entire methodology to finding out who decides inside each robot. At sea there is no need: water blocks radio waves, and that law splits the category into three families with no say from marketing. The ROV carries a human pilot through an umbilical cable, which is why it is the one robotics where nobody fakes autonomy. The AUV swims alone and out of coverage, so its autonomy cannot be a lie. And at the surface, drones like the Saildrone Explorer receive waypoints by satellite and solve the rest for months, including sailing into the eye of a category-4 hurricane.
That clarity makes the ocean our gold standard: when we judge whether a land humanoid is teleoperated or autonomous, we are asking the question physics answers here. The category's human extreme is OceanOneK, Stanford's haptic diver that carried its pilot's hands to 852 meters: teleoperation taken so far it becomes presence.
The missing map and the money arriving
The figure that defines this industry is a shared embarrassment: less than 30% of the seafloor is mapped to modern standards, worse than the surface of Mars. Closing that gap will be robot work (surface sonar, AUVs in lawnmower passes, ROVs to verify), and the funding is arriving with proper names: Valve's co-founder is building an $815 million science fleet whose data will be open, a story we tell in full.
For the practical reader, a buying note: underwater robotics has a consumer tier too. Consumer ROVs for inspection and recreational diving, like the FiFish V6, start around 1,500 euros, with a tether, 4K camera and about 100 meters of depth: the same architecture as an industrial ROV, at hobby scale. The house rule applies underwater as well: buy for the mission (depth, tether, sensors), not for the maker's video.
Related robots
Sailing ocean drone (USV)
Saildrone Explorer
The robot that sailed into a hurricane's eye and came back with the video.
Haptic underwater humanoid
OceanOneK
The diver that goes where no human can, with the hands of a human who stays above.
Consumer ROV
FiFish V6
An industrial ROV shrunk to laptop money: your eyes 100 meters underwater, joined to you by a cable.
Frequently asked
What types of underwater robots exist?
Three families by their relationship to the surface: ROVs, teleoperated through an umbilical cable; AUVs, autonomous and disconnected during the mission; and surface vehicles (USVs) like Saildrones, sailing alone with a satellite link. The physics of water, which blocks radio, imposes that division.
Why can't you pilot an underwater robot by radio?
Because water absorbs electromagnetic waves: radio, GPS and wifi penetrate no more than a few meters. The alternatives are a physical cable (the ROV's solution), acoustics (slow and low-bandwidth) or full autonomy (the AUV's solution). It is the only robotics industry where the autonomy level is dictated by physics rather than budget.
How much does an underwater robot cost?
The range is enormous: consumer ROVs for diving and inspection start around 1,500 euros; industrial work-class ROVs and scientific AUVs run from hundreds of thousands to millions, usually contracted as a service with ship and crew included. Data from platforms like Saildrone isn't bought at all: it is rented per mission.