Down to the depths, go we, as we discuss gators, explosions, fatburgs, and the stinkiest summer in London's history.

Sources:

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https://en.wikipedia.org/wiki/Thomas_Crapper

https://www.news-press.com/story/news/2016/06/14/11-foot-alligator-pulled-fort-myers-drain/85854510/

https://www.theguardian.com/uk-news/2018/apr/24/fatberg-autopsy-reveals-growing-health-threat-londoners

https://en.wikipedia.org/wiki/History_of_water_supply_and_sanitation

http://mentalfloss.com/article/48950/what-did-people-use-toilet-paper

https://en.wikipedia.org/wiki/Toilet_paper

https://www.sandiego.gov/mwwd/general/glossary

https://en.wikipedia.org/wiki/Sewage

https://en.wikipedia.org/wiki/Flocculation

http://time.com/4230222/la-modelo-sewer-bodies-colombia/

http://www.nydailynews.com/news/world/mom-chinese-baby-sewer-pipe-regretful-police-article-1.1357238

https://en.wikipedia.org/wiki/1992_Guadalajara_explosions

https://www.history.com/this-day-in-history/sewers-explode-in-guadalajara

http://www.eluniversal.com.mx/articulo/estados/2017/04/22/la-manana-en-que-guadalajara-parecia-zona-de-guerra#imagen-1

http://www.fox35orlando.com/news/local-news/nearly-a-million-gallons-of-raw-sewage-spilled-into-indian-river-lagoon-in-titusville

https://metro.co.uk/2016/04/21/council-tells-people-to-watch-their-bums-after-rat-bites-man-on-toilet-5830738/

https://gizmodo.com/a-python-crawled-out-of-the-toilet-and-tried-to-eat-thi-1778916990

https://en.wikipedia.org/wiki/Great_Stink

https://en.wiktionary.org/wiki/sewer