🚇➡️⚫️

#metro #light rail #tunnel #dark tunnel #entering tunnel

👷🔦⬇️

#headlamp #spelunking #underground exploration #dark tunnel #shaft access

🛣️➡️⚫️

#auto tunnel #road tunnel #highway tunnel #tunnel entrance #driving tunnel #dark tunnel #underpass

🛣️➡️🕳️⬅️🛣️

#road tunnel #dark tunnel #highway tunnel #underground road #through tunnel