China has completed construction of a secretive project to build a giant antennae five times the size of New York City.
The experimental radio antennae is rumoured to have taken 13 years to finish and will communicate long range with military submarines.
Extremely low frequency radio waves (ELF waves) will be emitted by the machine which will send messages to subs hundreds of metres underwater.
The Wireless Electro-magnetic Method (WEM) project is officially pegged for use on earthquake and mineral detection and but has clear potential applications for the military.
China has been hotly pursuing ELF technology for some time and the facility, which sits on a 1,400 square mile (3,700 sq km) patch of land, is the culmination of the technology.
Project WEM is made of a pair of high voltage power supply line which criss-cross a 100 km by 60 km steel lattice across the region.
Each power line is finished with an underground hole to two power stations and generators that electrify the ground.
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