Publisher's Synopsis
"HAND ME THAT WRENCH, MARK!"
What's Professor Amos Henderson up to now?
Why he's building a new wondrous new kind of submarine!
In the first installment of the Great Marvel series, the Professor built an airship.
This time, it's the South Pole and along for the ride are teenagers Jack Darrow and Mark Sampson, a few helpers, and the remarkable Washington White.
They encounter devil fish, angry whales, the tricky Sargasso Sea sucker fish and a giant octopus. They save a shipwrecked mother and daughter -- and then get into really hot water before they discover the Great Secret of the South Pole.
