This gave Prof. Von Bulow a much desired opportunity.
He studied them to his heart’s content while the Dart remained on the reef.
Captain Bell was also interested, and he and the professor became quite warm friends.
Frank was busy regulating the machinery of the boat preparatory to diving into the great valley.
In the submarine outfit was a number of diving suits of a pattern invented by Frank Reade, Jr.
They consisted of a helmet, with a reservoir of ample dimensions fastened upon the back, and which was supplied with air by a chemical generator, while the bad air escaped by a valve in the top of the helmet.
Upon the helmet was also placed a small electric lamp, but of great power of penetration.
With heavy weights upon their feet, the wearers of this ingenious diving suit, having not to depend upon cord or life line, could remain at great depths and for a long period under the sea.
It was proposed with Frank’s permission to use the diving suits that Captain Bell and the professor should don these suits and take a walk upon the sandy bed of the sea.
“Certainly you can take the suits,” said Frank. “Only be careful of sharks.”