The automobile bounced down the tunnel. More of Tesla's tubes, attached to the tunnel's roof, zipped past over-head and cast a staccato beat of harsh blue white light glowing from the tubes and darker shadows in the spaces between the tubes. The low roof curved sharply and it was low enough for Verne to reach up and touch it, had he dared. The walls of the tunnel were fairly smooth as if they had been bored out by a giant earthworm. There were places where water had run, causing the tunnel walls to have a slick, muddy appearance. The water had pooled onto the tunnel floor and the vehicle would splash noisily, throwing plumes of wet onto the passengers. Here and there, roots had infiltrated the ceiling and hung

(( uh.... that sentence there at the end? It seems to have failed to come to an end... *chuckle* ))
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Jonathan glanced over at his brother and said, "Yeah. He's all right. He just doesn't trust technology. Of any Kind." (( some reason for a capital Kind? ))
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"Well," Jonathan said, after a moment "Anyone interested in another go 'round?" His eyes were round and his hair was more disheveled than ever.
(( Of course, he has this HUGE grin on his face... *LOL* ))
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Verne nodded, understanding. "Monsieur Ratzenmueller certainly seems very... adept, it is true." He patted the seat cushion next to him and said, "This is a most unusual machine, I've never seen anything like it."
(( This last bit, these are two sentences. Technically, you either make them two, or you use a colon to unite them, eh? ))
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.... and on to the next one!!