A Voyage to the Inner World is a book presented as a true account written by Willis George Emerson in 1908, which describes the adventures of Olaf Jansen, a Norwegian sailor who sailed with his father through an entrance to the Earth’s interior at the North Pole.
Source: https://www.youtube.com/watch?v=eW0b9ZUpJmc
THE SMOKY GOD or A Voyage to the Inner World
https://ia902601.us.archive.org/22/items/smokygodorvoyage00emer/smokygodorvoyage00emer.pdf