The KM (Korabl Maket, literally ""Model-Ship""), known colloquially as the Caspian Sea Monster, was an experimental ground effect vehicle developed in the 1960s. 
The KM was the largest and heaviest aircraft in the world from 1966 to 1988, and its surprise discovery by the United States and the subsequent attempts to determine its purpose 
became a distinctive event of espionage during the Cold War.  

It was tested on the Caspian Sea for 15 years until 1980, when it was destroyed following a crash caused by pilot error. 
There were no human casualties, but the KM was damaged and no attempts were made to save it, it being left to float before eventually sinking a week later. 
The KM was deemed too heavy to recover and has remained underwater at the crash site ever since.

The KM remained the largest aircraft in the world during the entirety of its existence and is the second-largest aircraft ever built, behind the Antonov An-225 Mriya that flew for the first time in 1988.

The self-assembly model "Caspian Sea Monster" comes with a platform on which the ekranoplan is placed. The platform can be detached, allowing the model to be used for various purposes, such as prototypes, installations, technological toys, and more.

Schematic jet engine turbines are positioned on the fuselage, nose, and tail sections of the model—eight in the front and two in the rear.

This configuration made the "Caspian Sea Monster" prototype a unique aircraft with no equal in the world.

The model is made from colorful stainless steel, giving it vibrancy, and making it a worthy interior decoration.

Distinctive features of the "Caspian Sea Monster" model include windows on the fuselage, wing geometry, and movable ailerons on the main wings and tail section.

Like all Metal Time assembly kits, the "Caspian Sea Monster" model is made from environmentally friendly stainless steel that is used in the food industry and approved for manufacturing consumer goods and toys.