Sensational find in Italy: Cavers discover underground Adriatic river. “The path to follow was actually limited to a centimeter-long gap, it was so narrow that it was impossible to put a hand in,” says Marco Restaino.
It was hoped that this small passage would be short in length, but it took almost 40 years of hard work to create an artificial tunnel that stretches horizontally for almost 40 meters. There is no oxygen in the cave river.