Researchers showcase the feasibility of wireless communication underground, capable of penetrating solid bedrock.

      Korean researchers have successfully developed underground wireless communication, which could prove crucial in life-threatening situations.

      For many years, being underground meant losing all signal and means of communication. However, researchers at ETRI (Electronics and Telecommunications Research Institute) have revolutionized this with a significant innovation that, while seemingly straightforward, is truly remarkable.

      This new technology enables voice communication wirelessly at depths of up to 100 meters underground. It's a groundbreaking achievement that holds substantial importance.

      How does it function?

      The communication relies on magnetic field underground communication source technology and represents the first successful application of this type. Unlike traditional radio waves that are quickly absorbed by rocks and soil, ETRI's system employs low-frequency magnetic fields.

      The configuration consists of a transmitting antenna with a 1-meter diameter located on the surface and a small, handheld receiving sensor underground that operates at approximately 15 kHz. This configuration provides enough bandwidth for a data rate of 2 to 4 kbps, adequate for clear two-way voice communication.

      The research team successfully tested communication between ground level and the fifth underground level of a limestone mine, an area where current wireless technologies fail to operate.

      Previous studies had only achieved communication over a few tens of meters. ETRI has extended that distance to 100 meters, with plans for even further advancements.

      Why is this significant?

      Anyone who has witnessed news reports of mine or tunnel collapses understands the frustration rescuers experience when they lose contact with those trapped inside. This new technology could dramatically change that scenario. Rescue teams would be able to communicate in real-time with survivors who are buried, which could significantly enhance rescue operations.

      Consider it similar to the satellite communication feature found in Apple's latest iPhones. Just as that technology helps individuals stranded without network access connect to rescue services, this new system can assist those trapped underground.

      Its uses extend far beyond mining and rescue operations. This technology could be utilized in underground utility tunnels, oil and gas pipelines, and military bunker situations. Additionally, ETRI is aiming to connect this system to personal devices like smartphones, making it useful in actual rescue scenarios.

      The findings have been published in the IEEE IoT Journal, and patents have been filed for the essential components.

      Rachit is an experienced tech journalist with over seven years of experience in the consumer technology sector.

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