The Caspian Sea Monster, officially «KM» (Korabl Maket, Russian - Корабль-макет Experimental Craft), also known as the "Kaspian Monster", was an experimental ground effect vehicle (or ekranoplan)—a craft that flies, but stays close to the surface so it can rely on the ground effect. It was developed at the design bureau of Rostislav Alexeyev.

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