Police poured black dye in a beauty spot known as the 'blue lagoon' in the Peak District to deter visitors amid the coronavirus pandemic.
Officers took the action after reports that people were congregating at the spot, at Harpur Hill, Buxton during the nationwide lock-down.
Despite its beautiful appearance, the water is toxic and can cause skin irritation to swimmers.
A Facebook post by Buxton Police SNT said: "The location is dangerous and this type of gathering is in contravention of the current instruction of the UK Government."
People are currently being asked to stay at home unless for very limited purposes to prevent the spread of Covid-19, reports the Manchester Evening News.
Derbyshire Police had received criticism for their use of drones in the Peak District to spot anybody enjoying a stroll during the Government-imposed lockdown.
The force said it hoped the tactic would make the site look “less appealing”.
Some officers wore white overalls, masks and blue gloves as they dyed the water.
In a post on Facebook, Buxton Safer Neighbourhood Policing Team said: “Yesterday we received reports that people were congregating at the ‘Blue Lagoon’ in Harpur Hill, Buxton.
“No doubt this is due to the picturesque location and the lovely weather (for once) in Buxton.
“However, the location is dangerous and this type of gathering is in contravention of the current instruction of the UK Government.
“With this in mind, we have attended the location this morning and used water dye to make the water look less appealing.
“This is a regular tactic that we use to reduce anti-social behaviour and we work in partnership with HPBC and Derbyshire Fire and Rescue Service.
“However, as things stand, it has never been so important to discourage these types of gatherings.
“The photos below show our efforts this morning… and yes we did laugh at PC Parkinson and PCSO Small in the white suites!! Please stay at home.”
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