The town council of Guardamar del Segura has raised a red flag and prohibited swimming across its eleven kilometres of coastline following the discovery of two examples of the Glaucus atlanticus, commonly known as the blue dragon, at Playa Vivers. The mayor, José Luis Sáez, confirmed this decision via social media, emphasising the safety measures taken.

The alert was triggered by the head of the lifeguard service after locating the creatures on the shore. Consequently, a security protocol was activated, which includes a ban on swimming and preventative surveillance to ensure no additional individuals are present. Sáez stated that the red flag will remain in place for between twelve and twenty-four hours, depending on how the situation evolves.

The town council has made clear that although the beach remains open, signs will notify bathers via a public announcement system that swimming is prohibited. Despite this, Playa Vivers has continued to attract visitors, although significantly fewer people have ventured into the water.

The Glaucus atlanticus, although small at just four centimetres, can cause severe reactions. The blue dragon lives off jellyfish and can inflict painful stings, leading to nausea, vomiting, and intense pain. This species has re-emerged in the Mediterranean coastline after three centuries, with rising sea temperatures being linked to increased sightings. Local authorities urge swimmers to remain vigilant and adhere to safety recommendations.