Like underwater communication (covered last month), communicating underground such as in mines or tunnels can be quite tricky. There are various techniques like using repeaters, mesh networks or ground-penetrating low-frequency radios. This article covers all that and more. by Dr David Maddison
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There are many challenges when trying to communicate underwater using current technology. We take a look at how voice & data is transmitted through the sea to and from submarines, drones and other vessels. by Dr David Maddison