Subi Reef is one of the Spratly Islands contested by Viet Nam, China, Taiwan, Philippines and Malaysia. It is controlled by China who has constructed a 3-story building, wharfs, and a helipad here. The reef is naturally above water only at low tide.
Islands, Military - Navy and Coast Guard
Links: www.gwu.edu
By: Hinkkanen
http://www.reuters.com/article/2015/09/15/us-china-southchinasea-airstrips-idUSKCN0RE28220150915