Tensions rise as Philippines and China clash over South China Sea.

The Associated Press joined a recent voyage of two Philippine coast guard vessels patrolling the South China Sea, providing a glimpse of what it’s like for Filipino coast guard personnel to work on the front lines of multiple geopolitical conflicts in one of the world’s most fiercely contested seas. The patrols are a constant battle against sun, sea, stress and gnawing isolation. The Philippines dispatch regular patrols to assert their claims to the islands, spot encroachments, and resupply Filipino sailors stationed on the islands. China has rapidly built up its military presence in the area in recent years, pushing back other claimants like the Philippines and building artificial islands with airstrips and military garrisons.