Stealing the Seabed: Taiwan’s Battle Against Chinese Sand Dredging
For years, a quiet war has been waged beneath the waves of the Taiwan Strait. It isn’t fought with missiles or aircraft, but with massive vacuum-like pipes and industrial dredgers. Whereas often disguised as civilian activity, the illegal extraction of sand from Taiwan’s waters has emerged as a primary tool in Beijing’s broader strategy of gray-zone warfare
—a method of exerting pressure and asserting sovereignty without triggering an open military conflict.
At its peak in 2020, the scale of the incursions was staggering. According to data from the Coast Guard Administration (CGA), Taiwan expelled nearly 4,000 Chinese sand dredgers and transport vessels in that year alone, representing a 560 percent jump from 2019. While these numbers have declined in recent years due to aggressive new legislation, the dredging remains a critical component of the geopolitical tension surrounding the island.
The Strategy of Gray-Zone Warfare
Sand dredging is rarely just about the resource. While China requires vast amounts of sand for its construction industry and land reclamation projects, the placement of these vessels in Taiwanese waters serves a psychological and strategic purpose. By swarming areas near the Matsu and Penghu islands, Beijing tests the response times of the Taiwan Coast Guard and exhausts its operational resources.
“You dredge for sand on the one hand, but if you can also put pressure on Taiwan, then that is great, too.” Su Tzu-yun, associate research fellow at the Institute for National Defense and Security Research
Beyond the political signaling, the environmental impact is severe. Residents of the Matsu Islands have reported the erosion of beaches and the destruction of marine ecology. The industrial-scale suction of the ocean floor disrupts local fishing industries and, in some cases, threatens undersea communication cables, further compromising Taiwan’s infrastructure.
A Legal Counter-Offensive: Turning the Tide
To deter these incursions, Taiwan has shifted from simple expulsion to severe legal penalties. The government recognized that simply driving ships away was insufficient, as vessels would often return as soon as patrols departed.
Escalating Penalties
In 2021, the legislature passed an amendment increasing the stakes for illegal dredging. The penalties were raised to a maximum of seven years in prison and fines of up to NT$100 million (US$3.19 million)
. This legislative shift had an immediate effect; incidents dropped from the 2020 peak of 3,991 to 665 in 2021 and further down to 224 in 2022, according to Taipei Times reporting.
The Power of Confiscation
A significant legal loophole previously allowed ship owners to evade punishment by claiming the vessel belonged to a third party. This was highlighted in the case of the Huayi No. 9, a vessel seized in 2022. While the captain was sentenced to prison, a court initially ruled that the ship could not be confiscated as its ownership wasn’t explicitly proven to be linked to the perpetrator.
In response, the Legislative Yuan passed amendments to the Sand and Gravel Excavation Act
and the Act on the Exclusive Economic Zone and the Continental Shelf of the Republic of China
in December 2023. The new law allows the state to confiscate vessels and machinery involved in illegal dredging regardless of whether they belong to the perpetrator of the criminal act or not
.
The Current Landscape: 2026 and Beyond
As of May 2026, the nature of the conflict has evolved. While the massive “armadas” of dredgers seen in 2020 have diminished, they have been replaced by more sophisticated pressures. Taiwan now faces a combination of maritime militia activity, undersea cable interference and large-scale military drills designed to simulate blockades.
The Taiwan Coast Guard has responded by modernizing its fleet. Under a long-term strategy, the government is building over 100 new coast guard boats to ensure it can maintain a constant presence in restricted waters. These efforts are now integrated into joint drills with the military to prepare for a wider array of “gray-zone” threats, ranging from hijacked vessels to coordinated maritime incursions.
Key Takeaways: Taiwan vs. Illegal Dredging
- Historical Peak: Nearly 4,000 vessels were expelled in 2020, a 560% increase over the previous year.
- Strategic Goal: Dredging is used as a “gray-zone” tactic to exhaust Taiwan’s defenses and assert territorial claims.
- Legal Deterrents: Fines now reach NT$100 million, and jail terms can extend to seven years.
- Ownership Loophole: 2023 laws now allow the confiscation of ships regardless of who owns them.
- Environmental Cost: Severe erosion of coastlines and damage to marine biodiversity, particularly around Matsu.
Frequently Asked Questions
Why is sand so valuable to China?
Sand is a primary component of concrete. Due to strict bans on sand mining on its own coasts to prevent environmental collapse, China has looked to the South China Sea and Taiwan’s Exclusive Economic Zone (EEZ) to fuel its massive urban expansion and artificial island construction.
What is “Gray-Zone Warfare”?
Gray-zone warfare refers to coercive actions that fall between the traditional binary of “peace” and “war.” It involves irregular tactics—such as using civilian fishing or dredging fleets—to achieve strategic goals without triggering a formal military response from the adversary.
Are these vessels actually fishing boats?
While some vessels are registered as fishing boats, many are equipped with industrial dredging machinery. Taiwan’s Coast Guard frequently finds these ships pumping sand from the seabed rather than engaging in legitimate fishing activities.
The battle for the seabed is a microcosm of the larger struggle for sovereignty in the Taiwan Strait. By combining legal rigor with maritime modernization, Taiwan is attempting to signal that its resources—and its borders—are no longer open for exploitation.