South Africa Pushes Boundaries with Breakthrough Underwater Wi-Fi

South African innovators are making waves with a new underwater communication technology that can transmit sonar imagery almost instantly.

This advancement allows underwater drones to share detailed, high-resolution images of subsea infrastructure—such as pipelines and communication cables—as well as detect hidden hazards beneath the ocean surface, all in near real time. The result is a major leap forward in how quickly and efficiently underwater environments can be monitored and explored.

The system was recently put to the test during a sea trial in Simon’s Town, where its performance showed promising results. At the heart of the technology are two powerful components: synthetic aperture sonar (SAS) and a sound-based wireless communication system designed specifically for underwater use.

Together, these technologies tackle long-standing limitations in ocean exploration. Traditional sonar often struggles to produce clear images from a distance, and in many cases, data can only be reviewed once equipment returns to the surface—causing delays. This new approach changes both.

To enhance image clarity, the team developed sophisticated processing techniques alongside improved transducers, which act like underwater transmitters and receivers for sound waves. These upgraded components offer significantly greater bandwidth than older designs, allowing more data to be transmitted faster and with improved accuracy.

Synthetic aperture sonar plays a key role by delivering highly detailed imaging—comparable to upgrading from standard to high-definition viewing. It excels at identifying small or obscured objects that conventional sonar systems might overlook, making it especially useful across industries such as energy, marine research, and underwater surveying.

The technology can be deployed on autonomous underwater vehicles or attached to towed systems. However, precise movement is critical for accurate results. Factors like water currents and surface motion can interfere with data collection, so advanced algorithms are used to stabilize and correct the imagery.

Development follows a continuous cycle of testing and refinement. Systems are first calibrated in controlled environments before being evaluated in real-world conditions like oceans and dams, where variables such as waves and currents introduce additional challenges. Data from these tests is then used to further improve performance.

Another major focus is solving underwater communication challenges. Unlike radio signals, which degrade quickly in water, sound waves travel much more effectively. By leveraging this, the team has created a broadband acoustic communication system—essentially a form of underwater Wi-Fi.

With the help of ultra-wide bandwidth technology, this system can achieve data transfer speeds far beyond those of traditional acoustic methods, moving closer to the kind of performance typically associated with internet connectivity.

Altogether, this innovation opens the door to faster, clearer, and more responsive underwater operations—marking an important step forward in ocean technology.

A team of South African researchers has developed cutting-edge underwater Wi-Fi technology capable of transmitting sonar images almost instantly.

This breakthrough allows underwater drones to send high-resolution images of ocean pipelines, subsea cables, and even hidden underwater mines in near real time—dramatically improving the speed and efficiency of underwater inspections and exploration.

The innovation was recently tested during a sea trial in Simon’s Town, where researchers demonstrated the system’s capabilities. They are now refining two key technologies that make this advancement possible: synthetic aperture sonar (SAS) and underwater wireless communication using sound waves.

Together, these systems address two major challenges that have long limited underwater exploration. First, traditional sonar systems often produce low-quality images when scanning from a distance. Second, data typically cannot be accessed until the underwater vehicle resurfaces, delaying analysis.

To improve imaging, researchers developed advanced signal and image-processing algorithms, along with new wide-bandwidth transducers—devices that function like underwater antennas for transmitting and receiving sound waves. These components provide significantly higher bandwidth than traditional systems, enabling faster data transfer and sharper, higher-resolution images.

Synthetic aperture sonar, often compared to high-definition television for underwater imaging, is particularly effective at detecting small or hidden objects that conventional sonar might miss. This makes it valuable for applications such as pipeline inspections, mineral exploration, geological surveys, marine archaeology, underwater mine detection, and monitoring of undersea communication cables.

The sonar system can be mounted on autonomous underwater vehicles or deployed via towed platforms. However, maintaining a stable speed and straight movement is essential for accurate imaging. Environmental factors like waves and currents introduce motion that must be corrected using sophisticated algorithms.

Researchers conduct controlled testing in specialized facilities, where they calibrate equipment and refine algorithms. These are followed by real-world tests in oceans and dams, where unpredictable conditions help improve system performance. Data collected in the field is used to continuously enhance the technology.

At the same time, work is underway to solve the challenge of underwater data transmission. Unlike radio waves, which perform poorly underwater, sound waves travel efficiently through water. This has led to the development of a broadband underwater acoustic communication system—essentially underwater Wi-Fi.

Using advanced ultra-wide bandwidth transducers, the system can deliver data speeds far exceeding those of conventional acoustic communication technologies, bringing performance closer to internet-like speeds.

This breakthrough has the potential to transform underwater operations across multiple industries, enabling faster, more accurate, and more efficient exploration beneath the surface.