Subic Bay Philippines : White Sand Beach & Nice Dive Spots! For many centuries, Subic Bay was recognized as a deep safe harbour. Realizing Subic Bay’s potentials, the Spaniards used the bay as a port to defend and maintain the Philippines as a part of their empire in the 17th century. In 1885, it was built into a naval base that utilized the safe harbors and natural resources. ... Similar Editorial : Philippines Have Active Volcanoes by Douglas Scott. | Source : Travel Info