evidence: China now is attempting to expand its control to the southernmost extent of its nine-dash-line claim in the South China Sea, in waters ever closer to Indonesian and Malaysian shores. This area of the South China Sea, spanning from Indonesia’s Natuna Islands to the South Luconia Shoals, has greater strategic importance than the Spratly or Paracel Island chains farther to the north. Whereas the Spratlys have for centuries been regarded as "dangerous ground" and commercial mariners have avoided them, the vital sea lines of communication (SLOCs) connecting the Pacific and Indian Oceans flow through this part of the southern South China Sea. Therefore, these areas are far more vital to international commerce and navigation than the dangerous grounds closer to China’s Spratly Islands outposts. [...] On April 10, 2012, two Chinese law-enforcement cutters on joint patrol in the South China Sea received orders to proceed immediately to Scarborough Shoal, a disputed cluster of rocks 140 nautical miles west of Subic Bay, the Philippines. Earlier that day, a Chinese fisherman aboard one of several boats moored in the lagoon had transmitted an alarming message to authorities in his home port in Hainan: "Philippine Navy ship number 15 heading this way."