What do you think?
Rate this book


187 pages, Hardcover
First published November 13, 1981
Elated, the inventor invited the boys and Gerhard to come along on his next trip. They accepted enthusiastically, even though Rita was anxious.
"Gerhard, you must promise me not to go down in the sub!" she said. "In your condition, that is not a good idea. Suppose something happens — "
"In that little lake?" her husband laughed. "But I promise you anyway."
"Wow!" Frank exclaimed and wiped the perspiration from his forehead. "I'm glad we made it. Do you think the boat would have stayed in one piece after hitting the bottom?"
"I bet it would have been smashed to bits and us along with it," Joe replied. He shuddered at the thought, then took a deep breath. "We'd better get some fresh air before the oxygen runs out."