Divers will clean the seabed around the port of Sozopol today, reports BTA. "Since 2018, we have been doing the cleaning, completely voluntarily, with our own resources, with the idea of doing something useful for everyone," said Nayden Nedev, diving instructor and organiser of the action. Over the years, dozens of volunteers, members of diving clubs, have joined the initiative. Car tyres, iron and various household items are usually collected from the seabed.

The underwater clean-up starts at 9am and lasts until lunchtime. Only professional divers take part, as the water is quite cold - between 8 and 10 degrees.

Sozopol is home to the Centre for Underwater Archaeology, whose divers work to preserve, study and document the remains of ancient civilisations on the seabed in Bulgarian territorial waters.