The Philippine Coast Guard (PCG) has accused China of conducting unauthorized marine scientific research within Manila’s exclusive economic zone. The activity reportedly took place near the oil and gas-rich Reed (Recto) Bank in the South China Sea, according to a statement released on Thursday, May 7.
Maritime Patrol Findings
During a maritime patrol on May 6, PCG aircraft spotted the Chinese research vessel Xiang Yang Hong 33 near Iroquois Reef. The PCG reported seeing the vessel deploy a service boat toward the reef, which they claim confirms ongoing unauthorized research operations.
The patrol also identified a significant Chinese presence around the reef, including one Chinese Coast Guard vessel and 13 Chinese maritime militia ships. The PCG monitored 28 Chinese maritime militia ships near Thitu island during the same operation.
Competing Sovereignty Claims
The Philippines asserts that China lacked the necessary authorization for this research, calling the actions a violation of the United Nations Convention on the Law of the Sea and Philippine sovereign rights.
PCG commandant Admiral Ronnie Gil Gavan emphasized the country’s position on the matter. “We will continue to challenge any illegal activities that undermine our sovereignty and sovereign rights,” Gavan stated.
Diplomatic Response and Potential Outlook
Beijing’s embassy in Manila has denied the accusations, stating that the missions are “normal activities” conducted in accordance with international law. The embassy maintained that the vessels were operating in waters considered to be under China’s jurisdiction.
Given the current tension, the Philippines may continue to increase maritime patrols to monitor the area. There is a possibility that diplomatic disputes regarding the United Nations Convention on the Law of the Sea could intensify as both nations maintain opposing views on jurisdiction.
Frequently Asked Questions
Which Chinese vessel was involved in the research?
The vessel spotted by the Philippine Coast Guard was the Xiang Yang Hong 33.

Where specifically was the unauthorized research conducted?
The research was conducted near Iroquois Reef, which is located near the oil and gas-rich Reed (Recto) Bank within Manila’s exclusive economic zone.
What was China’s response to the accusations?
Beijing’s embassy in Manila stated that the research vessels were carrying out “normal activities” in accordance with international law in waters they consider to be under China’s jurisdiction.
How should international bodies balance scientific research with national sovereignty in disputed waters?
