Space to Sea: An Underwater Robot Takes a Deep Dive

What’s the difference between deep space and the deep sea? For a robot, the answer is: not much. Both environments are harsh and demanding, and, more importantly, both are far removed from the machine’s operator.

That’s why a team of engineers who developed robots at NASA’s Johnson Space Center in Houston have decided to apply their expertise to designing a shape-changing submersible robot that promises to dramatically cut costs for a host of maritime industries.

“What NASA really taught us to do is to put together robust software autonomy with a capable hardware morphology and deploy it in a remote setting,” said Nic Radford, Founder and CEO of Houston-based Nauticus Robotics Inc. During his 14 years at Johnson, Radford was, among other roles, the deputy project manager and chief engineer for design and construction of the humanoid space robot Robonaut 2. Now, more than 20 engineers who worked on that project and other NASA robots have joined the 80-person team he’s put together at Nauticus.

Whether a robot is working in space or on the ocean floor, the biggest commonality is that the operator is far away, with limited communication and knowledge of the robot’s surroundings, he said. “Even if you’re putting it on the space station and controlling it from the ground, there’s not a high-speed data network. Talking to the space station to control the robot is more akin to using dial-up.” So the robot has to be able to sense and understand its environment, navigating obstacles and manipulating objects with minimal operator input.

For Robonaut 2, this meant Radford’s team at Johnson had to develop not just advanced robotic hardware like tendon-powered hands, elastic joints, and miniaturized load cells, but also vision systems, force sensors, and infrared sensors to gather information, as well as image-recognition software, control algorithms, and ultra-high-speed joint controllers to process and act on that data.

Built under a partnership between NASA and General Motors, Robonaut 2 was billed as an astronaut assistant and was proven aboard the International Space Station. But it was also a demonstration and testbed for advanced robotic systems.

Unlike a robot in space, deep-sea robots that service offshore oil wells or wind turbines, for example, can be connected to an operator with a cable to allow high-speed data transfer and close control. But Radford noted that this comes at the high price of staffing and operating a huge support vessel on the ocean surface, to the tune of about $100,000 and 70 metric tons of greenhouse gas emissions per day.

Instead, Nauticus is eliminating that cord by enabling its robots to carry out tasks with minimal supervision, which can come from a control center on a distant shore. Bright orange, fully electric, and about the size of a small sports car, Aquanaut, the company's signature robot, resembles a sleek, propeller-powered torpedo as it motors to its destination. At that point, though, its shell pops open, and the nose flips upward to reveal a suite of cameras and other sensors, now facing front. Two multi-jointed arms swing out, ending in dexterous claw hands that can be fitted with different tools.

Aquanaut is designed to be versatile, and Radford points out that there is no shortage of different jobs for a subsea robot. The best-known industry that would benefit from an underwater robotic worker is offshore oil and gas production, which requires a huge amount of underwater equipment and support structure, all of which need inspection and maintenance. But the fastest-growing is wind power. About 25,000 offshore turbines are planned for operation by 2030, Radford said, and all of them will require servicing and inspection.

Other potential jobs include port management, maintaining subsea telecommunication cables, offshore mining of rare materials, and defense applications.

By applying space solutions to maritime problems, Radford and his team plan to make the Nauticus name synonymous with ocean robotics. By early 2022, Nauticus had produced two Aquanauts and planned to have 20 more built in the following three years, along with several custom variants. The company primarily plans to use them to provide affordable services to ocean industries, rather than selling them.

For more information, visit https://spinoff.nasa.gov/Space-Robotics-Take-a-Deep-Dive .

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