Frank had provided for this contingency, however, in the construction of the boat.
A door opened from the cabin into a vestibule. Entering this the divers closed a door behind them and opened a valve which flooded the vestibule.
Then they opened the outer doors with impunity and walked out on the deck.
The return to the cabin was effected by entering the vestibule, closing the outer door and turning another valve which expelled the water by pneumatic pressure. Then they could safely enter the cabin.
This was only one of the simplest of the many wonderful devices with which the Dart was provided.
Once out on deck the divers experienced queer sensations for a moment.
The pressure of the water for a time made them blind and dizzy.
But they soon recovered and went over the Dart’s rail.
They stood upon the bed of the ocean. It was a wonderful reflection.
About were all the wonders heretofore denied the sight of man. Truly this was no ordinary experience.