Occurred on July 30, 2023 / Novalja, Croatia
Info from Licensor: "I was with a group of friends, swimming off the coast of Novalja in Croatia, when we discovered an underwater cave. We then realized the cave had a clear passage all the way through and decided to take on the daunting task of submerging ourselves underwater and travelling through the tight cave and out the other end. Inside the cave there were many sea urchins and rocks so we had to be careful to avoid such dangers. This was made even more difficult due to the fact we had no goggles so all we could see was a faint light coming from the other end of the tunnel."