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China Has Radio Antenna to Talk to Submarines and It Covers Five Times Area of NY City
The Wireless Electromagnetic Method (WEM) project took 13 years and will emit extremely low-frequency radio waves (ELF waves). Those waves have been linked to cancer by the World Health Organisation.
Its transmissions could be picked up by a submarine lurking hundreds of meters under the sea, thus reducing the vessel's risk of having to resurface to receive transmissions.
China built its first military-grade Super Low-Frequency transmission station in 2009. The United States and Russia already have submarine communication systems.
Project WEM's main surface structure is a pair of high voltage power supply lines stretching from north to south, east to west on steel lattice towers, which form a cross that is 60km (37 miles) wide and 80km to 100km (50 to 62 miles) long.