http://www.atimes.com/article/chinas-atlantean-ambition-for-the-south-china-sea/

The proposed new base, which could in theory be operated 24/7 through usage of cutting-edge artificial intelligence (AI) technology, would dramatically bolster China’s quest for superiority in a largely unseen underwater struggle for one of the world’s most important waterways.

One reported candidate location for the proposed base is the Manila Trench, which reaches a depth of about 5,400 meters and is known to be pervaded by negative gravity anomalies. It is also associated with frequent earthquakes and a subduction zone responsible for the belt of volcanoes on the Philippine island of Luzon.