In our world, this day in 1908 was marked by the fall of the Tunguska meteorite. And in this, a monstrous experiment of unknown forces connected two geological eras through time, laying a mysterious Fault line across the ocean expanses. A gunboat of the Russian navy with a group of scientists on board crosses the edge of worlds and finds itself in the distant past, when the planet was inhabited by giant lizards. Participants of the expedition expect not only battles with ferocious monsters, but also the first imperialist war for territory in the new world - with the crew of an English cruiser...