Second Chinese Submarine Drone Mothership Emerges

China appears to have built two unusual vessels intended to deploy, recover, and support uncrewed underwater vehicles, or UUVs. Their configuration suggests a specialized role rather than ordinary transport or combat operations. The vessels could help China operate underwater drones far from its shores.

The larger ship was reported at Hudong-Zhonghua Shipyard on Changxing Island in Shanghai. The second vessel was spotted in Guangzhou and has nearly the same overall design, though it is smaller and includes some moldline changes. Both feature a flight deck, a hangar, a stern garage door, and a well deck.

The Guangzhou vessel was built by Guangzhou Shipyard International, or GSI, on Longxue Island. Archival satellite imagery showed it inside a covered graving yard area before launch. The appearance of two vessels so close together may indicate a broader Chinese program rather than a one-off experiment.

An uncrewed underwater vehicle mothership is a support vessel designed to operate underwater drones. It carries UUVs, sends them into the water, retrieves them, and provides a place to handle or maintain them. This lets the drones work far from their home ports.

The suspected Chinese vessels have a stern garage door and well deck for moving vehicles through the back of the ship. Large pylons can lift UUVs from the water and move them between levels inside the vessel. A flight deck and hangar sit behind the forward superstructure, adding aviation-related support space.

An ordinary naval ship may carry weapons, sailors, aircraft, or cargo, but this design emphasizes repeated UUV launch and recovery. The article identifies the ships as possible motherships, not confirmed operational vessels. Their unusual layout shows that China is exploring dedicated support for large underwater systems.

The newer Guangzhou vessel is not a full-size copy of the Shanghai ship. The article estimates that it is about one-third smaller overall. It still has nearly the same basic shape, but its proportions and overall moldline include minor changes.

The clearest difference involves the lifting equipment. The Guangzhou vessel has six lift towers in total. The larger Shanghai vessel has six larger towers plus six smaller ones, making twelve towers altogether. These structures are central to the ships’ suspected UUV-handling role.

The size difference does not remove the major design features. Both vessels show a flight deck and hangar behind the forward superstructure, along with similarly placed smokestacks. Their shared layout suggests related purposes, even though the Guangzhou ship may have a different capacity or design emphasis.

These features create a system for handling underwater drones at sea. The stern garage door and well deck would let UUVs enter and leave through the rear of the vessel. That is more useful for repeated underwater-vehicle operations than a conventional side-loading arrangement.

The large pylons are the key mechanism. They would lift vessels up and down out of the water and move them to different levels inside the ship. The flight deck and hangar sit behind the forward superstructure, while the smokestacks and other major features follow the same broad arrangement on both ships.

Together, the layout could support launching, recovering, storing, and tending UUVs during extended missions. The article does not provide a detailed maintenance procedure or confirm the exact equipment inside the hangar. It does show that the ships were designed around moving large numbers of underwater systems efficiently.

Large, long-range UUVs could perform missions that require persistent underwater presence. The article lists seabed mapping, submarine hunting, ship hunting, and mine searches. These tasks would give operators information and influence beneath the surface without requiring a crewed vessel to remain in the danger area.

The vehicles could also launch cruise missiles and drones. The article describes another possibility: turning them into immensely destructive weapons in their own right. Their long endurance could allow some systems to remain on patrol for very long periods, extending the reach of the mothership and its underwater force.

These missions explain why dedicated support ships matter. A mothership could deploy, recover, and tend many smaller UUVs or a few very large ones. The article presents the capabilities as potential uses, not as proof that every listed mission is already operational.

More UUV motherships would give China a repeatable way to move underwater systems beyond nearby waters. A single ship could launch and recover many smaller vehicles or a handful of very large ones. A fleet would expand the number of missions that could occur at distant locations and make support more persistent.

The ships would also recover and tend the vehicles while deployed. Some UUVs could remain on patrol for very long periods, allowing the motherships to support an expeditionary underwater force rather than making a single launch. This creates an asymmetric capability because the systems could operate without placing large crews directly in the underwater vehicles.

The article says distant American outposts in the Pacific, and even the U.S. seaboard, could become targets of concern. Two ships might still serve mainly experimental purposes. More vessels would signal greater strategic importance and clarify the People’s Liberation Army Navy’s plans.

Autonomous underwater vehicles are difficult to detect because water hides them from direct visual observation and blocks ordinary radar from reaching them. They can also be much smaller than crewed ships or aircraft, giving sensors less to find. Their underwater movement may further reduce the obvious signatures associated with surface vessels or aircraft.

Control is a separate challenge. Radio signals do not travel effectively through seawater, especially over long distances. A UUV therefore cannot normally maintain the same continuous, high-bandwidth link used by many aircraft or surface ships. It may need onboard navigation, programmed tasks, acoustic communications, or occasional surfacing or data transfer.

The article does not detail these technical limits, but they help explain the value of motherships. A support ship can deploy, recover, and tend vehicles, while the UUV operates independently between contacts. This combination could extend missions while reducing the need for constant remote control.