Home Information Distress at sea and precautions Distress at sea and precautions Red flag, rules of bathing and safety at sea Red flag Distress at sea and precautions.Red flag, rules of bathing and safety at sea. Red flag raised on the flagpole of seaside resorts or directly on the sand, means dangers of bathing and it is forbidden to bathe at sea.Together with the yellow flag, it means lack of sea surveillance at certain times or end of surveillance. RECOMMENDATIONS Avoid bathing if you are not in perfect physical and mental conditions. Do not make too much effort even if you are an excellent swimmer. After a long sun exposure, gradually enter the water and first dip your head, your abdomen and your chest. Three hours must pass between your last meal and the time to bathe. Do not enter the water when there is the red flag. Do not bathe if the water is too cold. If you cannot swim, do not adventure too far. You can go to the beach from 09:30 to 19:00. Surveillance is low from 13:30 to 15:30.