Waste materials, including human excreta and several hundred pounds of celery root, are perpetually recycled into the food, alcoholic beverages and, apparently, mind-altering drugs that the populace requires. Camilla Nylund, the only one of the original principal cast from the first run and the only one to make an effect, admirably portrays an Elisabeth who is deranged from the start, playing her entrance as Marguerite's jewel song, repeatedly mutilating her hands at the end of Act II and ultimately committing suicide in a tank of bio gas.
Braun, William R. (2016) Recordings/Video: Bayreuth Festival - "Richard Wagner: 'Tannhäuser'". In: Opera News, Vol. 80, No. 8, pp. 50-51. Available at https://openmusiclibrary.org/article/672764/.