The Caspian Sea is well known for being the world's largest inland body of water, its vast oil and gas reserves and, of course, the Caspian Sea Monster... Wait – the Caspian what!? The Caspian Sea Monster! A ground-effect vehicle (known as ekranoplan in Russia) that puzzled Western intelligence agencies until even the Russians themselves came to the conclusion that while inherently cool, it in no way presented a feasible project for any military or civilian adaption.