"Are you sure?" asked Mr. Petrofsky.
"Yes," answered Tom in a low voice.
The Russian looked about him, flashing the candle on several turnings and tunnels. Suddenly Ned uttered a cry.
"Why, we passed this place a little while before!" he said. "I remember this pillar that looks like two men wrestling!"
It was true. They all remembered it when they saw it again.
"Back in the same place!" mused the Russian. "Then we have doubled on our tracks. I'm afraid we're lost!"
"Lost in a Russian salt mine!" gasped Tom, and his words sounded ominous in that gloomy place.