in the Carter Case (1941) "Secrets of the Underground (1942) - Overview". TCM.com. Retrieved 2015-11-07. Sandra Brennan. "Secrets of the Underground (1943)...

Secrets of the London Underground is a British factual documentary series presented by railway historian Tim Dunn and London Transport Museum's Engagement...

Underground Secrets (Swedish: Underjordens hemlighet) is a 1991 Swedish drama film directed by Clas Lindberg. Lindberg won the award for Best Screenplay...

facing cannibalistic monsters and uncovering an ancient secret buried deep underground. The game was released via early access on February 23, 2023,...

claims to own special secrets shows a strong inclination to favor its members. Historian Richard B. Spence of the University of Idaho offered a similar...

Archived from the original on August 21, 2024. Retrieved August 22, 2024. King, Jordan (August 20, 2024). "Secret Level Trailer: God Of War, Dungeons...

The Polish Underground State (Polish: Polskie Państwo Podziemne, also known as the Polish Secret State)[a] was a single political and military entity formed...

Underground Railroad: The Secret History is an American-Canadian documentary television series, which premiered in 2022 on Discovery Channel Canada, Science...

The Velvet Underground was an American rock band formed in New York City in 1964. It originally comprised singer and guitarist Lou Reed, Welsh multi-instrumentalist...

The Tongmenghui of China was a secret society and underground resistance movement founded by Sun Yat-sen, Song Jiaoren, and others in Tokyo, Empire of...