After a drop in visitors due to fear of stone-throwing from Silwan, more groups have recently been visiting the tunnel. Both ends are watched. Enter the tunnel from the spring end. There is a small entrance fee. Go before or after the rainy season, when the water is lower and warmer.
Flashlights are preferable to candles, which add to the soot and can be snuffed out by wind.
Allow yourself 45 minutes to an hour, wear shorts or pants you can roll up, and footgear that can get soaked. From the exit you can walk back up the hill to the Dung Gate parking lot. Walk through this tunnel. Run your hands across the chisel marks. Stoop through the narrow entrance that hard-driven workers stooped through 2,700 years ago to save Jerusalem from the Assyrians, and you will sense the ancient drama which unfolded here, with an immediacy few places can convey.