A Vietnamese cargo vessel sank in the disputed waters of the South China Sea, leaving 23 crew members missing, while rescue teams continue a large-scale search operation involving Chinese and Vietnamese authorities.

The cargo ship, Khoi Nguyen 18, was carrying 62 Vietnamese nationals when it encountered trouble near Fiery Cross Reef in the Spratly Islands. According to Reuters, 39 people have been rescued, while efforts remain underway to locate the remaining crew members.

Distress Signal Triggered Rescue

Authorities in China's Hainan province said a distress flare from the vessel was detected on Saturday evening by the Chinese rescue ship Nanhai Jiu 115, prompting an immediate search-and-rescue mission.

Multiple rescue assets have since been deployed, including six Chinese vessels, one rescue helicopter, and a Vietnamese rescue vessel, to comb the waters surrounding the accident site.

Cause of Sinking Still Unknown

The Vietnamese-registered cargo ship measures nearly 70 metres in length and has a gross tonnage of 999 tonnes. Officials have not yet disclosed the cause of the sinking, and investigations are expected to begin once rescue operations conclude.

Authorities are currently prioritising efforts to locate the missing crew members amid challenging maritime conditions.

Incident in a Sensitive Maritime Zone

The accident occurred near Fiery Cross Reef, part of the Spratly Islands, one of the world's most disputed maritime regions. China refers to the island chain as the Nansha Islands and claims sovereignty over much of the South China Sea.

The region has remained a geopolitical flashpoint due to overlapping territorial claims by China, Vietnam, the Philippines, Malaysia, Brunei, and Taiwan.

Recent Tensions in the South China Sea

The sinking comes just days after renewed tensions between Chinese and Philippine forces in the South China Sea.

The Philippine military accused the Chinese Coast Guard of confronting Filipino personnel near the Second Thomas Shoal, where the grounded naval vessel BRP Sierra Madre serves as a military outpost. China disputed the allegation, claiming Philippine personnel initiated the confrontation.

The South China Sea is one of the world's busiest maritime trade routes and is believed to contain significant reserves of oil and natural gas, making it strategically important for regional and global shipping.

Search operations for the missing crew members are continuing.