A few hints to the ppl who would like to take these kind of pics:
1. Use the M-setting, that is Manual aperture, Manual Exposure, Manual ISO settings, Manual zoom-factor and most important: Manual focus. (This one was @ f2.8, 30s, 100ISO)
2. Determine your zoomfactor (wider is better, you can crop afterwards), lock your zoom if possible, and then focus at infinity on manual. For this you may use a street-light at decent distance to auto-focus on, an then switch to manual focus. If left on autofocus your camera won't be your best friend for this...
3. Shoot in RAW: This pic was actually heavy over-exposed, but a little bit HDR-tonemapping made it quite acceptable.
5. Shoot at large aperture. Ok, it makes focussing a bit more fragile, but you really need the contrast (for capturing those less-bright tunnels) unless you're in really, really close. It beats higher ISO-settings anytime...
4. Shoot lowest ISO: 100, 200 maybe 400, larger makes it difficult for post-processing.
6. Test your settings: shoot a pic at say, 10sec, take a look and determine if it is dark enough (taken that you didn't get a flash ;). If it's pitch-dark you can go to 30 sec or even bulb-settings.
7. It's better to over-expose than to under-expose (darkening the shot works, lighting up will not!)
8. Don't get struck with lightning, that could potentially hurt your equipment
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