By Liz Lagniton | 2026-07-02

The U.S. government has transferred four Ocean Aero Triton autonomous underwater and surface vehicles to the Philippine navy, providing the Armed Forces of the Philippines with a new unmanned capability to strengthen maritime surveillance.

The four solar-powered systems, valued at approximately $13 million total, were turned over to the Philippine navy's Unmanned Surface Vessel Unit One during a June 22 ceremony at Naval Operating Base Subic in Zambales, a province roughly 200km from Scarborough Shoal in the South China Sea.

The Tritons are designed to collect data above and below the ocean's surface while operating autonomously for up to 30 days.

The transfer comes as Manila continues to modernize its military for territorial defense amid recurring maritime tensions in the South China Sea, where Philippine and Chinese forces have confronted each other repeatedly in disputed waters.

The autonomous platforms will improve the country's ability to deal with challenges like "illegal fishing, gray zone activities, and threats to freedom of navigation," the U.S. Embassy in the Philippines said in a statement.

"The Indo-Pacific’s maritime domain is vast, contested, and critical, and the Philippines sits at the heart of it," U.S. Embassy Chargé d'Affaires ad interim Bridgette Walker said.

"Gray zone" refers to actions that stop short of war but tax an adversary's security forces.

Persistent surveillance

The Tritons will let the Philippine navy patrol "critical waterways," Walker added.

The solar-powered Tritons that the United States donated differ from conventional unmanned underwater vehicles that require frequent recovery and battery recharging.

The systems transmit information through a resilient mesh network, enabling persistent surveillance across wide maritime areas.

The platforms can carry mission-specific payloads, including side-scan sonar, passive acoustic sensors and other specialized equipment. They can be launched from shore facilities, vessels or boat ramps.

The Tritons can support intelligence, surveillance and reconnaissance, antisubmarine warfare and mine countermeasures, depending on their payloads, Defense News reported.

Growing unmanned fleet

The autonomous platforms could eventually be integrated into the Philippine navy's modern fleet as the service depends more on unmanned technologies, the navy said.

"Integrating unmanned systems in our ships can expand our operational reach, enhance situational awareness, and strengthen our capabilities," Philippine navy spokesperson Capt. Marissa Martinez said, according to a Philippine News Agency report.

Deployment locations have yet to be determined and will depend on operational requirements identified by the Armed Forces of the Philippines (AFP)'s geographic commanders, Martinez said. She added that details on future missions could not be disclosed for security reasons.

The donation builds on broader U.S. efforts to support the AFP's transition from internal security operations toward territorial defense and expand the Philippine navy's unmanned inventory.

The service established its Unmanned Surface Vessel Unit One in 2024 and has already received other U.S.-provided unmanned surface vessels, including MANTAS T-12 and Devil Ray platforms.

U.S. forces demonstrated the Tritons during this year's Balikatan exercise before Washington transferred them to the Philippine navy as part of its broader efforts to strengthen the AFP's unmanned capabilities, Defense News reported.

Broader security partnership

The platform provides "persistent maritime awareness at ultra-low cost and low logistics burden," in the words of Andre Morabe, Ocean Aero's vice president for international strategy, to Naval News. They address what he described as a critical capability gap for an archipelagic country responsible for monitoring "thousands of islands and a vast [Exclusive Economic Zone]."

In June, U.S. and Philippine forces conducted joint maritime exercises involving air and coast guard assets in the South China Sea. The Triton transfer supports the Philippines-U.S. Security Sector Assistance Roadmap, a multiyear initiative to accelerate the delivery of radar systems, unmanned platforms and other capabilities for maritime surveillance.

The donation follows recent tensions around Scarborough Shoal after Philippine officials protested China's deployment of a floating platform equipped with an antenna before the Chinese removed it in mid-June.

The Tritons give the Philippine navy another long-endurance unmanned capability as it steps up persistent maritime monitoring in key Philippine waters.