Mr. Farnum smiled, then added:

"There they go, under electric power. Watch!"

By the time that the boat had gone a little more than a hundred feet one
of the correspondents called out:

"They're sinking!"

"All a part of the performance," stated Mr. Pollard.

Before some of the visiting journalists could quite realize it, the tip
of the conning tower had disappeared below the surface.

"That's all very interesting to look at," half shuddered one of the women.
"But what if they couldn't bring the boat up again?"

"The boat is built to go up or down, at need," Mr. Farnum assured her.
"Captain Benson has never had an accident yet."

So the group of some thirty newspaper people watched intently, keeping
their gaze on the place where they had seen the last ripples close in
over the vanishing conning tower.

The minutes passed by. The shore boat, with the hundred-pound anchor and
cable in the bow, hovered just where Captain Jack had directed, but what
could be going on in the submarine at the bottom of the little harbor?

"Mr. Farnum, don't you sometimes get nervous over such things?" demanded