User blog comment:Dekagamer7X9/World Idea: Hellfire Depths/@comment-32136031-20151208222732/@comment-24203813-20151212021956

Well actually, it takes place in an era where archaeologists are exploring it. Me and some others have estimated it taking place around the 1920s-1940s. It's obviously inspired by things like Tarzan and Indiana Jones, which both involve modern exploration in an ancient jungle setting.