How some Southern California tunnels are still used, while others have vanished
The rugged geography, dense population, and arid nature of Southern California has created the need for some of the most ...
The Mirror16 天
Strangest tunnels in the world from 'entrance to hell' to mysterious passage made by sloths
Reporting back to his YouTube channel (Exploring With Fighters), Dan found heavy steel doors guarding the entrance to the maze of tunnels, as underground trains could be heard rumbling overhead.