Spratly Islands are on top vast oil and natural gas deposits. Everyone and their brother are claiming the islands. For years different nations would send out sailors/soldiers to squat on different outcroppings. Squat is the correct term as most of the “islands” are no more than 2 ft above sea level and only small huts were constructed. Until China started Terrain Forming larger islands.
US did that back in the late 1970’s and called it Diego Garcia. We called it “Fantasy Island” but official title was “Footprint of Freedom.” Lagoon in the middle and 2 small islands on top made it look like a footprint.