There is a Lake that is so Alkaline it can Turn Metal into a Rust-Resistant Coating - Apparently.
Lake Natron, located in Tanzania, has a pH level of around 10.5, making it one of the most alkaline bodies of water on Earth. The lake's unique chemistry is due to the presence of sodium carbonate and other minerals, which are deposited from the surrounding volcanic landscape. This has led to the discovery that metal objects submerged in the lake can be coated with a rust-resistant layer, making them useful for art and preservation projects.