L Ultime Secret de la glace bleue (Fleuve noir)

The concept of a subterranean world feels both thrilling and terrifying. I wonder if it was inspired by real myths or scientific theories.

The story jumps straight into action, which kept me hooked, but I was curious if that was the author's intention or if it developed during writing.

The mix of science and fiction felt seamless, but I’m curious whether the science was heavily researched or more of a storytelling tool.