Add Yahoo as a preferred source to see more of our stories on Google. Silo 18’s tunnel system connects the underground city to the outside world and also other silos. This is confirmed when Lukas Kyle ...

The DigIndy Tunnel System, a 28-mile tunnel located 250 feet beneath Indianapolis, is now fully operational and designed to ...

Astrophysicists are mapping a vast, hidden structure in the gas around the Sun that behaves like a tunnel carved through interstellar space, potentially linking our solar system to distant stars.

(MIRROR INDY) — Citizen Energy Group’s DigIndy Tunnel System has been under construction for more than a decade and is finally nearing completion. But many still have questions about the $2 billion ...

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. INDIANAPOLIS — Nearly a football field below ...