The Sewers were very important to the moving of supplies and personal. They have recreated a section, which could not be done in American because of “safety”. You go into pitch black tunnels. Totally black. You smash into stone walls, it makes a small maze with dead ends, side tunnels and curves. Only takes 3 minutes or so to get through, but it is enough to make most people deeply uncomfortable. Images from the Warsaw uprising Museum. More then worth seeing, knowledge guides, everything is in both English and Polish.