China has built a giant experimental radio antenna on a piece of land almost five times the size of New York City, according to researchers involved in the highly controversial project.
The Wireless Electromagnetic Method (WEM) project took 13 years to build but researchers said that it was finally ready to emit extremely low frequency radio waves, also known as ELF waves. Those waves have been linked to cancer by the World Health Organisation-affiliated International Agency for Research on Cancer.
Although the project has civilian applications – officially it will be used for earthquake and mineral detection and forms part of China’s 11th five-year plan – it could also play a crucial role in military communications.
Scientists said that its transmissions could be picked up by a submarine lurking hundreds of metres under the sea, thus reducing the vessel’s risk of having to resurface to receive transmissions.
The project follows the construction of China’s first military-grade Super Low Frequency transmission station in 2009.
The next year, a Chinese nuclear submarine successfully communicated with the station from deep water – making China the third country in the world to have established such a submarine communication system, after the United States and Russia.
But the Chinese navy is eager to expand its capacity and has been pouring resources into the more advanced ELF radio technology, which allows submarines to communicate with the command centre from a greater depth and is harder to disrupt.
The Chinese government, however, has played down the importance of the facility, which occupies some 3,700 sq km (1,400 square miles) of land, in information released to the public.
Apart from the need to protect an important strategic asset, some researchers said that the secrecy was to avoid causing public alarm