This research explores the concept of the "queer urban underworld" in late socialist Prague, where hidden and marginalised spaces allowed alternative identities and subcultures to flourish despite state control. Framed by queer theory, spatial theory, and intersectionality, the analysis reveals how these underworlds both reflected nd reshaped power dynamics, social identity, and urban space. Through archival research, mapping, and oral histories, this research uncovers how queer individuals navigated state surveillance and transformed the urban environment.