The Pit is an incredible dive site in Tulum Mexico. A fresh water sinkhole with unlimited visibility a hydrogen sulfide layer (aka the cloud) and an island of debris (with its own tree which you can see in the picture) says photographer Tom St George.
Before we start, you should know that this is not a joke. According to the scientists from the University of Exeter, smelling farts in fact prevents cancer, among other diseases. When the bacteria break down food,
Sulfur on a rock caused by volcanic gas/ Hydrogen sulfide often results from the microbial breakdown of organic matter in the absence of oxygen gas, such as in swamps and sewers; this process is commonly known as anaerobic digestion.
Hydrogen sulfide greatly enhances plant growth: Key ingredient in mass extinctions could boost food, biofuel production
Hydrogen sulfide greatly enhances plant growth: Key ingredient in mass extinctions could boost food, biofuel production -- ScienceDaily
Sulfur dioxide preservatives in dried fruit, sulfites in wine, and the putrefaction of undigested animal protein in the colon can release hydrogen sulfide, the rotten egg gas associated with inflammatory bowel disease.