Markes listened to the first three stops from the robοt in his native language and the rest in English from a human tour guide.
“I should thank Persephone, our robot, she said very fine things,” said Christos Tenis, a Greek visitor. “I’m impressed by the cave. Of course, we had a flawless (human) guide, she explained many things. I’m very impressed.”
Persephone is not the only technology used inside the cave. There’s a cellphone app in which a visitor, scanning a QR code, can see the Alistrati Beroni. That’s a microorganism that is only found in this cave, in the huge mounds of bat droppings left behind when the cave was opened and the bats migrated elsewhere.