|First appearance||"The Inhuman Torch" (7ACV18)|
The helium miners are people who work at the solar helium mine. In 3013, fifteen of them were trapped in the mine, after a collapse caused by Zapp Brannigan, but they found safe haven in the mine's doom chamber. [7ACV18] Fry, Leela, and Bender were sent there, and kept laughing at their voices, which, due to the helium, were very high-pitched. Bender managed to rescue all the miners, and Mayor Poopenmeyer later awarded a medal to him.
The helium miners first appeared in a preview clip for 7ACV18, released nine days before the episode aired. 
Helium miner #1: Stop! That's the force field hold'n' the mine open!
Leela: Attention, helium miners. Can you hear me?
Helium miner #2: For God's sake, help us!
Helium miner #3: We're in agonising pain!
[Leela, Fry, and Bender laugh.]
Leela: [to Fry and Bender, whispering] Stop laughing! [to the miners, screaming] Help is on the way!
Bender: In the meantime, you should sing a song, to keep your spirits up. How about... "Camptown Races"!
Helium miners: [singing] Camptown ladies sing this song.
Helium miner #4: Thank you. Thank you, sir. You're a true hero.