Vietnam has once again been plagued by multiple subsea cable outages.

As reported by VN Express, four of the six subsea cables that connect the country have suffered disruptions due to multiple simultaneous faults within these cables, though the specifics of these faults have not been revealed.

Vietnam is connected by six undersea fiber-optic cable systems: AAG, IA, AAE-1, APG, ADC, and SJC2, with the last two being the newest cables.

The cables impacted include parts of the SJC2 cable, which connects the country to other parts of Asia; the AAE-1 cable, which has seen issues since February; the Asia-America Gateway (AAG), which connects Southeast Asia with the US; and the Intra Asia (IA) cable have also seen issues. Repairs on the AAG and IA cables are expected to start this month.

The SJC2 cable is the latest to suffer disruption, notes VN Express, which reports that the cable developed a fault in its S4 segment near Chung Hom Kok, Hong Kong, last week.

These faults have led to mobile network operators in the country reporting network disruption, including VNPT and Viettel, while around 30 percent of Vietnam's international Internet traffic.

In order to navigate these challenges, Viettel has added 800Gbps of international connectivity via the IA cable on Wednesday, and is also adding 300Gbps through the Asia Pacific Gateway.

It's not the first time the country's subsea cables have suffered severe disruption. In 2024, three cables connecting Vietnam (IA, APG, and AAE-1) were all hit by outages, while a year earlier, all five cables that connected the nation at the time were down simultaneously.