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The Blue Lagoon, Derbyshire, UK
A disused quarry in Harpur Hill called Far Hill Quarry was flooded and became “The Blue Lagoon” due to its striking blue tint. It became a popular swimming spot among locals even though warning signs have already stated the dangers it possesses.
First, the water is as toxic as ammonia with a pH level of 11.3, which is highly alkaline and can cause fungal infections such as skin and stomach problems. The lagoon also contains rubbish like car parts, dead animals, and excrement. To make it even more convincing that the water is dangerous to swim in, the council decided to dye it black.
