It is based on H. P. Lovecraft's Cthulhu Mythos, particularly At the Mountains of Madness, and is a follow-up to Infogrames' earlier Shadow of the Comet.

The main character is a young U.S. intelligence officer, Lt. Ryan, who has been assigned to a British submarine, HMS Victoria, for a special mission.

Three French-language comic books were published as tie-ins to the game: La Geôle de Pandore (Pandora's Jail), Le Glaive du Crépuscule (The Dagger in the Dusk) and La Cité des Abîmes (The City of the Depths).

The English voice acting of the PC version is retained, but the text which appears when examining or picking up objects is translated to Japanese.

[6] A reviewer for Next Generation gave the PC version three out of five stars, praising the gripping storyline, beautiful animation, and eerie atmosphere, but criticized the "emotionless" voice acting.