acid
From Trekipedia
The Horta of Janus VI used a powerful acid to create tunnels and digest rock.[1]
Notes and References
- ↑ Roddenberry, Gene (Executive Producer). "The Devil in the Dark." Star Trek, Season 1, Episode 25 (Production 26). Directed by Joseph Pevney. Written by Gene L. Coon. Desilu Productions, 9 March 1967.