When limestone bedrock collapses, it sinks and forms a pit. Acting as a reservoir, this pit then fills with a mixture of fresh groundwater and saltwater. Eventually, organic matter ends up in the trench, and when it decomposes, it produces a halocline (a cloud of hydrogen sulphide) that separates the freshwater at the top from the saltwater below.So how does this happen? Salty water? Just pure pollution?
>hydrogen sulphideWhen limestone bedrock collapses, it sinks and forms a pit. Acting as a reservoir, this pit then fills with a mixture of fresh groundwater and saltwater. Eventually, organic matter ends up in the trench, and when it decomposes, it produces a halocline (a cloud of hydrogen sulphide) that separates the freshwater at the top from the saltwater below.
Source: https://mymodernmet.com/anatoly-beloshchin-mexico-yucatan-cenote-angelita/