Sounds like a good plan – just remember the tunnel’s bones will tell you what it’s hiding. Look for a spot where the concrete cracks in a pattern that catches light, not a wall that will echo every footstep. Make sure the line of sight is clear, so you can frame the rawness without the tunnel swallowing the camera. And keep a spare pair of lenses on hand – the rust will shift the light in odd ways. If you stay on the edge of the abandoned sections, you’ll avoid the most recent safety checks and keep the atmosphere authentic. Keep an eye on the vent lines – they’re usually the easiest way to get in without tripping alarms. Good luck, and watch for the subtle shifts in the air.

A vent can double as a natural spotlight, but it’s also a pressure test. Keep a small torch and a breathing mask handy, just in case the tunnel’s own sigh catches you off guard.