Assisted by Matt, Carl got into one of the seats, while Matt climbed into the other.
"All ready," announced Matt, in a loud voice.
Instantly a glow from the acetylene lamps flooded the gloom ahead. The boys could see a rocky tunnel, wide and high, leading straight on through the heart of the cliff.
"Ach!" chattered Carl. "Ve go py kingdom come now, I bed you."
"Hardly that," laughed Matt. "We're bound for daylight once more. Wait and watch."
Swiftly and surely the white car glided on. Presently the boys saw trailing vines and bushes ahead of them, similar to the screen at the other end of the tunnel.
Snap! Off went the lights. Then, with startling suddenness, they brushed through the screen and were once more in the broad light of day.
The gully lay before them, and when they had reached the center of it the car came to a halt.
"Vouldn't dot knock you shlab-sitet?" murmured Carl wonderingly. "In vone door und oudt der odder! Ach, blitzen, und den some! Aber who vas dot vat shpoke in der tark?"
"Here's where we find out," rejoined Matt, leaping down.