ROV Manipulator Arms: All-Electric Underwater Robotic Arms for Every Mission

Reach Robotics designs and manufactures all-electric ROV manipulator arms for inspection, maintenance, repair and intervention in harsh subsea environments. The range covers three families: Reach Alpha, Reach Bravo and Reach X. They run from a 2 kg-lift lightweight arm for portable ROVs to a 10 kg-lift, 900 mm-reach manipulator for observation and inspection-class vehicles, with depth ratings of 300 to 450 metres of seawater (MSW).

We have built underwater robotic arms since 2016 in Australia, and more than 800 Reach manipulators are now in service with commercial operators, navies, research institutes and recovery teams. This page explains how ROV manipulators work, compares the three families, and shows you how to choose the right arm, end effector and controller for your vehicle and mission.

What Is an ROV Manipulator Arm?

An ROV manipulator arm is a remotely operated robotic arm mounted on an underwater vehicle. It lets a pilot on the surface grab, cut, turn, clean, sample or recover objects at depth. Without one, an ROV can only look. With one, it can do the work that would otherwise need a diver, and work beyond a diver's reach. Divers are typically limited to around 50–80 MSW, while ROV manipulators make intervention possible at depths that were previously out of reach.

Every subsea manipulator system has three parts:

• Joints and functions: each joint is driven by its own sealed electric actuator, and each powered movement (shoulder, elbow, wrist rotate, jaw open/close) is one "function". More functions give more dexterity and a larger working envelope. Reach arms use electric actuators instead of hydraulic cylinders.
• End effector: the tool at the tip, such as jaws, cutters or recovery tools. On Reach arms these can be swapped in the field.
• Controller: the topside interface the pilot uses, from a gamepad to a master arm that mirrors the manipulator's movements.

Robot vs Manipulator: What's the Difference?

A robot generally has some degree of autonomy: it senses, decides and acts on its own. A manipulator is the robotic arm that physically handles objects. On an ROV, the vehicle provides mobility, cameras and power, and the manipulator does the physical work. A pilot usually controls the manipulator in real time, so most subsea manipulation today is teleoperated rather than autonomous. As autonomous underwater vehicles (AUVs) mature, more subsea systems are starting to combine manipulation with autonomy.

robotic manipulators explained

Compare Reach ROV Manipulators at a Glance

All three families are all-electric, modular and built to the same ISO 9001:2015-certified quality system. The main differences are lift capacity, reach, depth rating and the class of vehicle each arm is designed for.

All three families are vehicle-agnostic. Beyond ROVs, they can also be integrated on other platforms, such as unmanned ground vehicles (UGVs), for various other applications.

Reach Alpha: Lightweight Manipulator Arms for Portable ROVs

Reach Alpha is a lightweight, dexterous robotic arm for portable-class ROVs. These vehicles have tight weight, buoyancy and power budgets, and the Alpha is built to fit inside them. It is available in 2-, 3- and 5-function configurations. The Reach Alpha Actuator is also sold on its own as a high-torque building block for custom systems.

• Rapid deployment: compact, low-power and quick to integrate on vehicles that can be launched by hand.
• Self-monitoring: internal temperature and vacuum monitoring, with leak detection before launch.
• Compliant under external force: when subjected to external loads exceeding its designed operating limits, the manipulator yields rather than maintaining rigid resistance, helping to minimise the risk of damage to the manipulator, host vehicle and surrounding assets.
• Field-swappable tooling: standard, parallel, quad, soft and cutter jaws, plus a special recovery tool.

The National Underwater Training and Recovery Centre (NURTC) has used the Reach Alpha 5 in recovery operations, which shows that a small arm can do serious work when it is in the right place.

Reach Alpha lightweight manipulator

Reach Bravo: Strong, Dexterous Arms for Inspection, Maintenance and Repair

Reach Bravo is our strongest and longest-reaching manipulator. It offers 10 kg lift, 900 mm reach and a 450 MSW depth rating in an all-electric arm built for observation and inspection-class ROVs. It is available in 2-, 3-, 5- and 7-function versions. The Bravo 7 gives the full dexterity needed for complex intervention.

Bravo is built for the core IMR tasks that keep offshore assets operating:

• Ultrasonic thickness (UT) and cathodic protection (CP) measurements
• Close visual inspection (CVI) with an IP wrist camera
• Light intervention, including cleaning, cutting and valve operation
• Sampling and object recovery

Grab force is adjustable, so the same arm can hold a delicate probe or a heavy tool. Built-in collision self-protection and a software interface with 3D visualisation help pilots work close to structures with confidence. Bravo is vehicle-agnostic and is used on a wide range of observation and inspection-class ROVs. For Saab Seaeye Falcon operators, a verified Bravo Integration Kit makes fitting even faster.

In the field, Bravo is used by major energy-sector service providers, including Fugro and Geo Oceans. Geo Oceans used Bravo manipulators to improve efficiency and reduce costs on mooring chain and flowline inspection campaigns. Also, Fugro, a global service provider, used our Bravo arms for Non Destructive Testing (NDT) and contact based inspection of various subsea assets, as well as other subsea campaigns where complex movement is required and divers aren't an option.

Reach Bravo IMR manipulator Geo Oceans inspection case study

Reach X: Modular Arms for Mission-Critical Intervention

Reach X is designed for adaptive remote intervention where failure is not an option. It is built around a modular joint design with high torque density and a strong lift-to-weight ratio. Joints can be replaced in about five minutes, so operators carry fewer spares and lose less time on deck.

The family includes X2, X3, X5 and X7 arms, plus the Reach X5 AIS and Reach X7 AIS (Advanced Intervention System). Each AIS is a complete, ready-to-integrate intervention package rather than a single arm: dual manipulator arms on a skid, full integration cabling, a wrist camera, two topside controllers and software.

Reach X mounts on portable and inspection-class ROVs. Defence is its primary market, and it is suited to:

• Defence and security tasks, including clearance diving support and disarming
• Missions that must cut, grab, recover or disarm in confined spaces
• Offshore inspection and intervention

Reach X supports the widest set of control options in the range: master arm, Command Pod, gamepad, Reach Control software and an API for custom integration.

Reach X modular manipulator 

Why All-Electric? Electric vs Hydraulic ROV Manipulators

Traditionally, ROV manipulators have been hydraulic, powered by a hydraulic power unit (HPU) on the vehicle. Hydraulics still make sense for very heavy lifting on large work-class ROVs. For most inspection and light-to-medium intervention, however, an electric manipulator offers practical advantages:

Because an electric arm needs no HPU, smaller vehicles can carry real intervention capability. That lowers mobilisation cost and vessel requirements. It also makes tasks practical that were once reserved for large, expensive spreads.

How to Choose the Right ROV Manipulator Arm

Use these seven questions to narrow your selection before you configure:

1. What vehicle will carry it? Check the ROV's payload, buoyancy, power and mounting space. These usually rule a family in or out straight away.
2. What are the tasks? Inspection probes and sampling need dexterity and fine force control. Cutting and recovery need lift and jaw strength.
3. How many functions do you need? See the guide below.
4. How deep will you work? Alpha and X are rated to 300 MSW; Bravo is rated to 450 MSW.
5. What reach and lift are needed? Measure the distance from your mounting point to the work and the heaviest object you will handle.
6. Which end effectors? Pick jaws and tools for each task; all can be swapped in the field.
7. How will you control and integrate it? Choose between master arm, Command Pod, gamepad, Reach Control software or API.

Manipulator Functions Explained

End Effectors, Cameras and Controllers

A manipulator is only as useful as its tooling and control. Every Reach arm is supported by a matching accessory ecosystem.

End Effectors and Tooling

Interchangeable jaws include standard, parallel, quad, wide quad and soft jaws, as well as cutter jaws for rope, line and, depending on the system and cutter, cable. The Reach Alpha Special Recovery Tool handles awkward objects, and the Bravo End-Effector Interface lets you mount custom tools. Vacuum pulling kits are available for Alpha, Bravo and X.

ROV manipulator end effectors

Cameras

The Reach Bravo IP Wrist Camera and the Reach Micro IP Camera put low-light video at the point of work, which is essential for close visual inspection and precise tool placement.

Controllers and Software

Pilots can choose a 5-function or 7-function Master Arm, which mirrors the manipulator for intuitive control. Alternatives are the Command Pod, a gamepad, or Reach Control software with 3D visualisation. Integrators and researchers can use the API to build manipulation into their own systems.

ROV manipulator controllers 

Proven Across Industries

• Offshore energy and infrastructure: UWILD, NDT, CVI and sampling. Major service providers, including Fugro and Geo Oceans, use Reach Bravo manipulators in the field.
• Defence and security: Reach Robotics has worked with the Australian Defence Force, the US Navy and the UK Ministry of Defence.
• Search, recovery and policing: special recovery tooling and portable systems for fast deployment.

Marine science and research: soft jaws for delicate sampling, and an API for autonomous manipulation research.

Frequently Asked Questions

What is the difference between a robot and a manipulator?

A robot generally has some autonomy: it senses, decides and acts on its own. A manipulator is the robotic arm that physically handles objects. On an ROV, the manipulator is usually controlled by a pilot in real time, although autonomous manipulation is growing as AUVs mature.

How deep can Reach ROV manipulator arms operate?

Reach Alpha and Reach X are rated to 300 metres of seawater (980 ft). Reach Bravo is rated to 450 metres of seawater (1,480 ft). Deeper capability is on the way, with a next generation of Reach Robotics manipulators to work up to 1,000 MSW.

Are electric manipulators as capable as hydraulic ones?

For inspection and light-to-medium intervention, yes. They often offer finer control, more intuitive controllers, no oil-leak risk and the option to use smaller vehicles. Hydraulic arms remain the better choice for very heavy lifting on large work-class ROVs.

Which ROVs are Reach manipulators compatible with?

Reach Alpha suits portable-class ROVs. Reach X suits portable and inspection-class ROVs. Reach Bravo suits observation and inspection-class ROVs. All three are vehicle-agnostic and can be integrated on a wide range of ROVs, and our team can advise on yours.

How much does an ROV manipulator arm cost?

Price depends on the family, the number of functions, the end effectors, the cameras and the controller you choose. Use the online configurator for each manipulator to build your system and get pricing.

Configure Your Manipulator

Whether you need a lightweight arm for a portable ROV or a 7-function manipulator for complex IMR, there is a Reach manipulator built for the job. Build your system in the Reach Alpha, Reach Bravo or Reach X configurator to get pricing, or contact our engineers to talk through your vehicle and mission.