Coco Island

[link to en.wikipedia.org]

China supposedly established a SIGINT intelligence gathering station on Great Coco Island in 1992 to monitor Indian naval activity in the Andaman and Nicobar Islands.[3] The station is also said to allow China to monitor the movement of other navies and ships throughout the eastern Indian Ocean, especially in the crucial point in shipping routes between the Bay of Bengal and the Strait of Malacca.[3] It may also be used to monitor activities at the launch site of the Indian Space Research Organization at Sriharikota and the Defence Research and Development Organization at Chandipur-on-sea. The Chinese Army is also building a maritime base on Little Coco Island.[5]
Existence of the Chinese base has been questioned.[4] In 1998, the U.S. stated that it had not detected any significant Chinese activity in Burma.[6] India’s Chief of Naval Staff is quoted as saying in October 2005 that India had “firm information that there is no listening post, radar or surveillance station belonging to the Chinese on Coco Islands.”[4][7] In 2014, Air Marshal P.K. Roy, Commander-in-Chief of India's Andaman and Nicobar Command stated that "China has been developing a runway for civilian purposes. There are no reports of presence of Chinese per se. The situation is not alarming." He added that there was only some civilian infrastructural developments which was not a threat to India.[8]