"How long ago was that?"
"An hour, maybe."
"While we were still rising. That would make sense. We've stopped again, you know. Professor Garet gave us a bulletin on it."
He had been going ahead of her in the narrow tunnel. Now it widened and they were able to walk side by side. There seemed to be no end to it. But then they came to a sturdy-looking door, padlocked.
"That's that," Don said.
"That's that nothing," she said. "Break it down."
He laughed. "You flatter me. Come on back."
"Don't you think this is at all peculiar? A tunnel starting under an abandoned grandstand, running all this way and ending in a locked door?"
"Maybe this was a station on the underground railway. It looks old enough."
"We're going through that door." She opened her purse and took out a key ring. On it was an extensive collection of keys. Eventually she found one that opened the padlock.