Go back into the manhole by jumping through time and moving to the required areas. Once inside, take note of where the light switch is found. Jump back to 1972 and click on the spot where the light switch should be. This will illuminate the area greatly. Use the bonesaw to cut through the grates and go inside, where you will find an empty syringe. Pick the syringe up and go back to the “modern” hospital. Use the syringe to get some turpentine from the bottle lying on the floor. Again, go to the sewer and switch to 1972. Go into the inner room and switch again to 2012. Go to the end of the area and use both the turpentine and the lighter on the rubble on the floor. Go back to the future hospital and you will find that the smoke has cleared the hornet’s nest blocking the way into the hospital. You can now enter through the hospital doors, ending the chapter.