Nauticus Robotics has completed the first prototype of a next-generation electric manipulator built for autonomous underwater robots. The company announced it on July 28, 2026. Instead of conventional hydraulics, it bets on electric drive, promising fewer failures, less downtime and lower operating costs in subsea work.
Key takeaways
- Completed prototype: a modular electric manipulator in a three-joint configuration.
- Planned variants: five-joint and seven-joint configurations.
- Electric drive instead of hydraulics — lower maintenance complexity and operating costs.
- Integration platform: the Aquanaut autonomous underwater vehicle, paired with ToolKITT software.
- Timeline: prototype completed in H1 2026, functional and load testing from July 2026.
Electric instead of hydraulic
Subsea manipulators have relied on hydraulic drive for decades. It is powerful and proven, but expensive to maintain — it needs sealed high-pressure fluid systems that tend to leak and fail in salt water. Nauticus is taking a different route.
The company has built a modular electric-drive manipulator. According to Nauticus, this architecture should reduce maintenance complexity, improve reliability, cut downtime and lower operating costs — while enabling advanced autonomous underwater intervention. The first prototype has three joints. It is the base for planned five- and seven-joint versions that will offer greater reach and freedom of movement.
Modularity is key here. Rather than designing a separate arm from scratch for each task, Nauticus builds a common joint module that can be repeated. The same logic — a repeatable, swappable module — is used today by actuator makers in humanoid robots.
Hardware and software designed together
Nauticus stresses that the manipulator is not a separate product bolted onto a vehicle. It is meant to work in tandem with ToolKITT software, which should autonomously recognize work sites, identify intervention points, compensate for changing underwater conditions and execute precise manipulation tasks.
Autonomous underwater intervention requires more than simply attaching a manipulator to a vehicle. It requires hardware and software designed together from the beginning.
Ameen Albadri, Vice President of Engineering, Nauticus Robotics.
The first integration platform will be Aquanaut — Nauticus' autonomous underwater vehicle, on which the company plans field demonstrations. In parallel it is developing Olympic Arm, an electric manipulator for traditional remotely operated vehicles (ROVs), built with an unnamed industry partner.
Context: autonomy underwater
The subsea robotics market splits into two worlds today. First, remotely operated vehicles (ROV?ROV: Remotely Operated Vehicle — an underwater vehicle piloted remotely by an operator, tethered by a cable to a surface vessel.) — proven, but requiring a constant tether and a surface operator. Second, autonomous vehicles (AUV?AUV: Autonomous Underwater Vehicle — an underwater vehicle that runs untethered and operator-free, executing its mission on its own.s), which run untethered but have historically been used mainly for inspection, not physical work. A manipulator capable of autonomous intervention blurs that line.
That matters for the offshore industry — pipeline inspection, subsea installation maintenance and offshore wind farm servicing. Every diver descent or ROV-crewed vessel costs money. An autonomous arm that finds a valve and closes it on its own removes part of that cost.
| Feature | ROV (remotely operated) | AUV (autonomous) |
|---|---|---|
| Tether | permanent cable to vessel | none — runs freely |
| Operator | required at the surface | none, autonomous mission |
| Typical use | intervention, but costly | mostly inspection |
Why it matters
Underwater manipulation is one of the hardest problems in robotics. Currents push the arm around, visibility can be zero, and any failure at depth means a costly recovery operation. Moving from hydraulics to electric is an attempt to make these systems simpler and cheaper to maintain — and therefore more viable in day-to-day work.
Equally important is the "hardware and software together" approach. In land robotics this is already standard, but underwater, where perception is far harder, integrating the arm with the autonomy layer is what lets the robot actually put a tool on target. If Nauticus delivers the promised reliability, electric manipulators could gradually displace hydraulic ones in new deployments — much as electric actuators are displacing hydraulics in humanoids on land.
What's next?
- Functional and load testing of the prototype began in July 2026 — the results will decide the next versions.
- For the rest of 2026 the company has planned additional prototype builds and further testing.
- Field demonstrations are planned on the Aquanaut vehicle — the arm's first test in real conditions.
Sources
- Nauticus Robotics Investor Relations — Nauticus Robotics, Inc. Completes First Prototype of Next-Generation Electric Manipulator
- Robotics Business News — Nauticus Robotics Introduces Next-Generation Electric Manipulator for Autonomous Underwater Robots
