Vrelo Cave at Matka Canyon

We had already hiked to Matka from Mount Vodno, but made a return trip to check out Vrelo: Macedonia’s most famous cave. Most of Vrelo lies underwater and athough nobody has managed to fully explore its depths, it’s presumed by many to be the deepest in the world.

In 2010, an international team led by Italian diver Luigi Casati organized an expedition to Vrelo. Casati reached the incredible depth of 212 meters and reported that the bottom was still nowhere in sight. It’s not been verified, but...