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www.theengineer.co.uk...
When wireless communication is transmitted through the air by systems like Bluetooth, there are significantly fewer technical obstacles to overcome. But in seawater there is limited bandwidth available and signals are subject to signal interference. In shallow water, signals bounce from the surface and sea bed, while in deep water, acoustic waves tend to travel in the depth of water where sound moves the slowest. The scattered movement of these waves creates signal echoes, which create interference in a digital communication system.