A bizarre Chinese naval vessel, nicknamed the “Bohai Sea Monster” for its unusual semi-submersible hull design, has been observed with fresh military modifications, suggesting it is being prepared for active testing or operational roles.
Recent imagery shows the vehicle fitted with new radar arrays and what appear to be hardpoints for weapons. The modifications mark a significant step beyond the purely experimental role it occupied since first being spotted in 2022.
The very close-up images also contrast with last year's rumors, which pointed to a very large vehicle. It is understood that it is at most about 30 meters long.
The craft is a ground-effect vehicle – often compared to Soviet-era ekranoplans – that flies just above the water surface using aerodynamic lift. Unlike earlier Chinese concepts, this one is powered by four turboprop engines and has a relatively modest size despite its pompous nickname.
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Soviet ekranoplan legacy
The most famous ground-effect vehicles were built by the Soviet Union during the Cold War. The 400-ton Caspian Sea Monster and the smaller Lun-class carried anti-ship missiles and could skim waves at high speed, evading radar.
China has explored similar technology for decades. The Bohai Sea vessel shares the same basic principle but uses a lighter, propeller-driven design that limits its payload and range compared to the Soviet behemoths.
Military analysts say the new sensors likely include a surface-search radar and electro-optical turrets. The hardpoints could accommodate light torpedoes, anti-ship missiles, or depth charges, giving the vehicle a role in anti-surface or anti-submarine warfare.
The vessel operates in the Bohai Sea, a shallow, enclosed gulf near Beijing that serves as a test range for new naval systems. Chinese state media has previously described the craft as a “high-speed transport” but did not mention weapons.
No official designation or service branch has been disclosed. The modifications suggest the People’s Liberation Army Navy or its research institutes are evaluating the vehicle for missions where a mix of speed, low-altitude flight, and sea-skimming capability would be useful.
If operational, the Bohai Sea Monster could fill a niche between fast attack craft and helicopters. Its main advantage – flying below radar coverage at wave-top altitude – also limits its ability to operate in rough seas or carry heavy loads.
