After 30 years of monitoring, a cave scientist discovered previously unknown new species in a cave hidden beneath a US military base in Alabama. The University of Alabama in Huntsville (UAH) announced that scientists at the university found a new cave fish species in a cave without eyes and with a nearly transparent body, naming it “Demogorgonichthys arcanus,” or the “Devil Cave Fish.”
The newly discovered fish was found in the Bobcat Cave below the Redstone Arsenal in Huntsville, Alabama. It lacks eyes, is almost transparent, and emits a faint electric-blue glow while alive.
The name “Demogorgonichthys” is inspired by the mythological underworld demon “Demogorgon” and is well-known from games like Dungeons and Dragons and the Netflix series “Stranger Things.” The Latin term “arcanus” means “hidden” or “secret.”
In February 2025, Dr. Matthew Nemiller of UAH was investigating the Bobcat Cave in Alabama. Many scientists had researched this cave over the past 40 years, considering it one of the most frequently monitored caves in the southeastern United States with no major discoveries expected.
Dr. Nemiller expressed surprise, stating, “We never expected to find it here.” He likened the discovery of a completely unknown freshwater fish genus in the eastern United States to finding a new species of lion or tiger, emphasizing the unexpected nature of discovering a new species in a cave observed for 30 years.
The underground water pool where the “Devil Cave Fish” was found is also home to another species, the Southern Cavefish, but these two species are not closely related. Over millions of years, both species independently lost their eyes and pigmentation as they adapted to their subterranean environments.
Maintaining a normal visual system in the perpetual darkness of caves requires energy but provides marginal benefits. Over time, cave animals gradually lose their eyes, pigmentation, and other features no longer essential for their survival.
During the study of this new species, researchers compared the physical characteristics of the fish with the Southern Cavefish. The Devil Cave Fish lacks color and possesses distinctive features such as its snout and body shape. Genetic testing revealed that this animal represents a separate lineage.
Redstone Arsenal, known as Alabama’s “Area 51” for its high secrecy and strict control, is responsible for vital defense, missile projects, and classified aerospace programs. Due to its limited discovery in a cave beneath the military base, researchers believe the fish species is highly sensitive to changes in the underground water environment.
Despite the protection offered by the military base restrictions, the cave system where the fish resides could still face threats from surface pollutants, sediment buildup, and hydrological changes. Researchers found traces of cadmium, chromium, and lead in the water samples from Bobcat Cave over the past two decades, with concentrations exceeding normal levels.
The findings from the UAH research team, in collaboration with researchers from three other regional universities, were published in the journal “Scientific Reports” in July. Dr. Nemiller emphasized that while the discovery of the Devil Cave Fish is remarkable and shrouded in mystery, the exploration work of the research team is far from over.
He stated, “The ‘Devil Cave Fish’ reminds us that even in seemingly extensively explored areas, our understanding of biodiversity is still far from complete.”