The dark right tunnel with chanting

You start to walk down the tunnel to your right, eager to see what is down there. As you wander the tunnels that feel like they will never end, your flashlight flickers one final time before going out, enveloping you in darkness. You shake the flashlight a bit to see if you can get any last bit of energy from it but alas, it's gone. You put the light in your bag and continue your way down the dark tunnel. As you walk the chanting only grows louder but you still can't make out what they are saying.

Then in the distance you see light. A fire to be exact. The fire seems to be in a small side room. It is grey and drab and yet you still can't get the thought out of your head that it was very clean to be a sewer. It still did not smell and you have not once seen any evidence of any piss or shit. "Maybe this part of the sewer has been abandoned?" you question. You cautiously start to approach the fire. As you get closer you spot around 8 people all dressed in green cloaks. You immediately sense danger but still decide to continue forward. "maybe they will help me" you think to yourself knowing that outcome was very unlikely but they were the only chance you had at getting out of here alive. You notice among the group is a tall man dressed in a red cloak unlike the green ones the others were wearing. "Hello?" you call out. The figures all stop their chanting immediately and turn towards you. "Can you help me? I'm lost," you continue. "She's here" the man in the red cloak says in his deep raspy voice. You look confused at them for a moment. "Yes? Can you he..." you say before getting cut off by the red cloaked man "The sacrifice!" he bellows.

Just then the people in the green cloaks surround you and restrain you. You try to put up a fight but they easily overpower you. You are picked up and carried off down another sewer tunnel. You start to struggle more which only angers the cultists. You arrive at another room where there is nothing but a stone slab with loose ropes next to it. You are thrown down onto the altar and the cultists begin to tear at your clothes and take your belongings. Looking around you see that the insides of the hoods of the cultists are darkened so you can't see their faces. "Strange, I only thought that happened in movies," you thought to yourself. Then the last of the clothing on your body is stripped away and one cultist grabs the rope that was beside the stone slab you lay on and ties you up. You can't move very much now and are **** to lay there and do whatever they command. The cultists all gather around you and start to chant with the red cloaked one next to your head and the others crowding around you. They start to chant in a language you can't understand and by the sound of them they are all males apart from one female who has an incredible voice. You are **** to lay there and endure this horrid chanting for around 30 minutes, after which they stop; An eerie silence falls across the room. In complete silence, two of the green-cloaked cultists pick you up from the ankles and the shoulders and carry you over to a ladder. They then haul you up the old ladder and undo a manhole which leads to the surface. You squint at the light as your eyes adjust while the cultists lay you down next to the hole. One of them then grabs something from under their cloak and place it down next to you. The other one grabs a lighter and lights the object on fire. It starts to burn, emitting a strange odour from the flames which you don't particularly like but it does get you aroused for some reason. You start to hear a lot of shuffling from around the street and zombies start to emerge from homes and from behind cars.

You have to act fast. What do you do?