More than 200 swimmers took to the pool at Peterborough Lido this morning – after a rush to buy last minute tickets for the sunrise swim.
Organisers said they were “delighted with the turnout” for the annual summer solstice dip, which invited hardcore swimmers to complete their first lengths at 4.15am.
Organiser, Claire Smith, of Vivacity, said: “The buzz in and around the pool was so special and feedback has been really positive.
"We'd like to thank all of our staff for making it happen on what really is the longest day of the year for the Lido.
"Having opened at 4.15am for the sunrise swim, it was straight into the early morning session at 7am and will close after the evening session at 8.30pm.”
The summer solstice marks the longest day of the year and falls on Wednesday, 21 June.
The amount of daylight hours a place can get will vary from location to location, and depends on how close you are to the North Pole.
Claire added: "This has kickstarted what promises to be a great summer season - look out for fitness classes, theatre performances and the ever-popular dog swim."
Take a look at all the action in the next 12 images:

1. Peterborough Lido
Peterborough Lido is full of swimmers as it opens early this morning for a dawn swim on the summer solstice in Peterborough, Cambridgeshire, UK, on June 21, 2023 (image: Paul Marriott). Photo: Paul Marriott

2. Peterborough Lido
The Peterborough Lido, was built in 1936, and still retains the fabulous art deco look today (image: Paul Marriott). Photo: Paul Marriott

3. Peterborough Lido
Peterborough Lido captured by drone as the sun rises across the city (image: Paul Marriott). Photo: Paul Marriott

4. Peterborough Lido
Happy snappers take a selfie as they queue up to head into the sunrise swim at the lido. Photo: David Lowndes
