it's known as the 'Blue Lagoon', but the flooded former quarry near Buxton hides a toxic secret.
It's so polluted that it's almost as toxic as bleach.
There are warning signs that state the water can cause skin and eye irritations and stomach problems, but people continue to swim there.
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Officers are appealing for information from the public to help trace a missing Warrington man.
Samuel Brown has today been jailed for 18 months for sexual offenses against a 15-year-old girl.
Emergency services are treating the incident as a suspected gas explosion at the moment. Two people are believed to be seriously injured.