Taiwan's Internet Blackout Drill Highlights China Threat to Global Economy

Taiwan recently conducted its first-ever mobile internet blackout drills this week, simulating a communications disruption in response to potential attacks on its critical undersea cables by China. Part of the annual Han Kuang military exercises, these drills aimed to test how the civilian population would cope with digital isolation. The exercises, which deliberately slowed mobile internet speeds, affected approximately 70% of the population across 14 cities and counties in northern and central Taiwan.

The drills are directly linked to escalating concerns over the security of Taiwan's 24 undersea communication cables, which include 14 international and 10 domestic links, described as the island's "digital lifeline." Reports indicate that China-linked vessels have allegedly damaged these cables in recent years, a tactic viewed as part of Beijing's "grey zone" strategy to deplete the island's resources without escalating to open conflict. Furthermore, Taiwan's National Security Bureau reported an average of 2.63 million daily cyber intrusion attempts targeting Taiwan's critical infrastructure in 2025, including energy grids, hospitals, and high-tech industrial parks associated with the semiconductor industry.

Such a communications disruption could have severe repercussions for Taiwan's economy and global markets. Experts estimate that a major outage to Taiwan's cable links could cost its economy $55 million per day and significantly disrupt global semiconductor supply chains. Undersea cables are the backbone of global communications, carrying over 95% of the world's internet traffic and enabling everything from financial transactions to government communications. Given Taiwan's pivotal role as the world's largest chip manufacturer, a shutdown of its chip plants due to internet disruption or cyberattacks could have a profound impact on the global economy.

The geopolitical tensions in the Taiwan Strait, coupled with China's claims over Taiwan, place the island under constant threat. In response, Taiwan has adopted a "whole-of-society defense" model, focusing on enhancing civil resilience. Learning from the experiences in Ukraine, Taiwan has accelerated efforts to diversify and strengthen its communication infrastructure. This includes the recent approval by Taiwan's Parliament of legal amendments paving the way for satellite internet services, such as Elon Musk's Starlink, to enter the island's market.

Analysts emphasize the vital importance of these drills in preparing the Taiwanese public for potential crises. Diversifying communication infrastructure and developing robust backup systems are crucial steps in enhancing the island's resilience. As international calls for greater undersea cable security intensify globally, Taiwan's proactive measures highlight the intertwined nature of national security and economic stability in the digital age.