With its burrow, this tortoise creates a subterranean environment that can be beneficial to other reptiles, mammals, birds and invertebrates.

The Bexar County karst cave invertebrates are troglobites, species that spend their entire lives in subterranean environments.

Tourists can access the subterranean environment on a tramway.

The olm's sensory system is also adapted to life in the subterranean aquatic environment.

The program explores the subterranean environment and culture beneath various civilizations.

But their subterranean environment is very high in CO2, which can lower the pH of tissues.

The first phase of the dig makes people comfortable in the subterranean environment, preparing them for Phase 2 - the crawl.

As their names suggest, stygophiles are partial to aquatic, subterranean environments, but are not necessarily restricted to them.

The most dramatic subterranean environment in the Black Hills is Jewel Cave.

Despite living in an entirely subterranean environment, Damaraland mole rats exhibit circadian rhythms, and are active primarily during the day.