Today we leave Croatia, and travel into Slovenia to the Postjena Caves. There are 27 kms of underground galleries and chambers through which travel by electric train. Some of the taller people in our group had to duck as the train travells fairly fast through the small tunnels. We were given a guided tour of the 3rd level (the first two levels are too unstable. The caves were pretty cool, a pitty a few of our tour were suffering from the gastro bug.