Through the tunnel of an abandoned mine in Serifos 

Music - as always from my collection :)
S U R V I V E - Hourglass
Ricardo Donoso - From Sterling To Snow
Steve Moore - Light Echoes II
S U R V I V E - Floating Cube
S U R V I V E - Omniverse
The area of Megalo Livadi (Serifos, Greece) has many caves and quarries of old abandoned mines... and a tunnel (the entrance is hidden by vegetation) that goes through a hill and ends up in a wild, deserted zone on the sea.