Anxious to explore the mysterious hidden world under metropolitan Berlin, an international group of four urban explorers hires a local guide, Kris, who leads them into the maze of escape tunnels and subterranean fortifications under the city. When their guide … Nathalie Kelley, Klaus Stiglmeier, Nick Eversman, Catherine de Léan, Max Riemelt, Brenda Koo, Adolfo Assor Added on Amazon Prime 2022-05-03. Youtube Trailer