Inside Russia’s Abandoned 400-Ton Flying Warship

The Soviet Union built a nearly 400-ton missile warship capable of flying just a few meters above the ocean at approximately 500 kilometers per hour. It was called the Lun-class ekranoplan—and nothing else in naval warfare looked quite like it. Powered by eight jet engines and carrying six enormous P-270 Moskit anti-ship missile launchers, Lun was designed to combine the speed of an aircraft with the payload and maritime reach of a warship. Its extremely low altitude allowed it to remain beneath the radar horizon of many surface ships until it was comparatively close. But only one missile-carrying Lun was ever completed. In this WarForge documentary, we explore the Soviet Union’s extraordinary ekranoplan program, beginning with the experimental KM—better known as the Caspian Sea Monster. At more than 500 tonnes, it was one of the heaviest machines ever to leave the water. We explain how aerodynamic ground effect allowed these enormous vehicles to fly, why the KM and Lun-class are frequently confused, and how the Soviets transformed an experimental machine into a heavily armed flying warship. We also investigate the engineering problems that prevented ekranoplans from becoming a major military force: enormous takeoff power requirements, rough seas, aerodynamic instability, limited maneuverability, saltwater corrosion, dangerous low-altitude operations and dependence on external targeting systems. Was the Lun-class defeated by its own engineering—or did the collapse of the Soviet Union kill the program before its problems could be solved? The story concludes with China’s mysterious four-engine ground-effect prototype and America’s DARPA Liberty Lifter program, revealing why military engineers are still returning to the same extraordinary idea decades later. CHAPTERS 00:00 China’s mysterious new Sea Monster 01:30 KM and Lun were different machines 01:50 The engineer behind the ekranoplan 02:30 How aerodynamic ground effect works 02:50 The 540-ton Caspian Sea Monster 03:40 The ekranoplan’s takeoff problem 04:30 The KM crashes into the Caspian Sea 04:50 From Orlyonok to missile carrier 05:10 Inside the Lun-class flying warship 06:20 Was Lun really invisible? 07:10 Waves, instability and rough seas 08:20 Flying 15 feet above the water 09:20 Trapped between ship and aircraft 10:00 Why the Soviet fleet never appeared 10:40 The final Lun becomes a monument 11:20 China’s modern ekranoplan prototype 13:00 America’s Liberty Lifter program 13:40 Why ekranoplans still struggle 14:20 Could the flying warship finally work? Subscribe to WarForge for more documentaries about forgotten weapons, experimental military machines and the engineering projects that pushed technology beyond its limits. Certain visuals are cinematic reconstructions created for documentary and educational purposes. The identity, operator and intended mission of China’s modern prototype remain officially unconfirmed. #CaspianSeaMonster #Ekranoplan #MilitaryEngineering