Chicxulub crater
"Dead Space: Martyr" is a 2010 novel which explores the origins of Unitology as well as the initial discovery of the original Black Marker by humanity. Set roughly 200 years before the events of the video game series, "Martyr" tells the story of geophysicist Michael Altman, who discovers a mysterious signal within the Chicxulub crater and after secretly obtaining a piece of the Marker, leaks it to the public and spreads the visions he received from it.