Entry to the museum on St Anastasia island will be free on Saturday, 31 October, for Black Sea Day, the organisers said.

The exhibition tells of the sea's secrets, its natural riches and the most interesting creatures that live in it. Video footage from the underwater park, chosen for the day, will also be shown.

The aim of the day is to protect the Black Sea and promote its natural and cultural heritage.

The boat Anastasia leaves Burgas at 10:00 and 13:30. Trips depend on the weather and may be cancelled in bad conditions.

On 27 October we reported that divers cleaned the underwater park off St Anastasia island during the autumn dive on 24 and 25 October. They cleaned the chapel, the icons and the statue of St Anastasia, and replaced the buoy that marks the site.

Seats on the boat can be booked on 0882 004 124 or by email.