| ▲ | Luc an hour ago | |
What are those dark brown cylinder shapes in the sides of the roughly hewn tunnel (first image on the right)? | ||
| ▲ | zulux 43 minutes ago | parent [-] | |
My hunch: Sound-deadening baffles. | ||
| ▲ | Luc an hour ago | |
What are those dark brown cylinder shapes in the sides of the roughly hewn tunnel (first image on the right)? | ||
| ▲ | zulux 43 minutes ago | parent [-] | |
My hunch: Sound-deadening baffles. | ||