Life on Earth is fed by sunlight - so one could think that the lack of sunlight means no life at all. The truth is just the opposite: a closer look reveals that most dark caves present wildlife in abundance. Recently cave divers and biologists have found previously unknown species under the picturesque capital of Hungary. The Molnár János Cave, the largest underwater thermokarst cave in Europe, has many more secrets in store. Following decided explorers, BUDAPEST INFERNO reveals the never before seen underground wonders of Budapest and the deepest secrets of evolution.