Qualla: Second Thomas Shoal

Second Thomas Shoal: Introduction

Thu, 09 Apr 2026 00:00:00 GMT

Photo credit NASA, Public domain. The BRP Sierra Madre is falling apart. Her hull is peppered with holes large enough for waves to slosh through into the hold. Rust has consumed entire sections of her superstructure. She has not sailed under her own power in decades and never will again. Yet this 100-meter World War II-era landing craft, deliberately run aground on Second Thomas Shoal in 1999, remains an active-duty commissioned vessel of the Philippine Navy, manned by fewer than a dozen marines whose resupply missions regularly make international headlines. What sounds like the setup for an absurdist novel is, in fact, one of the most consequential territorial standoffs in the South China Sea.

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Image: NASA | Public domain

Second Thomas Shoal: A Calculated Grounding

Thu, 09 Apr 2026 00:00:00 GMT

Photo credit Brocken Inaglory, CC BY-SA 4.0. Second Thomas Shoal, known as Ayungin in Filipino, sits 105 nautical miles west of Palawan in the heart of the Spratlys' Dangerous Ground. In 1994, China occupied Mischief Reef nearby, alarming Manila. Philippine president Joseph Estrada decided in 1998 to "as well put up our own...

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Image: Brocken Inaglory | CC BY-SA 4.0

Second Thomas Shoal: Running the Blockade

Thu, 09 Apr 2026 00:00:00 GMT

Photo credit Brocken Inaglory, CC BY-SA 4.0. Keeping the Sierra Madre garrison alive has required ingenuity. Philippine supply ships have navigated Chinese blockades using shallow-water routes where China Coast Guard vessels, with their deeper drafts, cannot follow. In March 2014, when Chinese ships blocked two civilian sup...

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Image: Brocken Inaglory | CC BY-SA 4.0

Second Thomas Shoal: Agreements Made and Broken

Thu, 09 Apr 2026 00:00:00 GMT

Photo credit Brocken Inaglory, CC BY-SA 4.0. The diplomatic layer is as convoluted as the maritime encounters. In 2017, under President Rodrigo Duterte, the Philippines accepted a gentlemen's agreement with China to maintain the status quo: no construction materials would be allowed to reinforce the Sierra Madre, in exchang...

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Image: Brocken Inaglory | CC BY-SA 4.0

Second Thomas Shoal: The Reef Beneath the Ship

Thu, 09 Apr 2026 00:00:00 GMT

Photo credit Brocken Inaglory, CC BY-SA 4.0. Second Thomas Shoal itself is a submerged reef near the center of Dangerous Ground. Its coral rim surrounds a lagoon with depths up to 27 meters, accessible to small boats from the east. Drying reef patches emerge at low tide on both sides. In July 2016, the Permanent Court of Ar...

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Image: Brocken Inaglory | CC BY-SA 4.0