Fins on fire 🔥

Went in the beach at Kalotaritissa in Donousa, Greece (https://goo.gl/maps/oes7iMFmtubmobcu9) and was snorkelling in about 10m from the beach when I saw the first one. As I think it’s a stinger, I immediately stopped and then looked around and there were about 5 more. At that point I made a U turn and pretty quickly exited the water. I have the video on GoPro, but took a screenshot for the sighting report.