"By gum! I reckon he's right there," muttered Captain Broadbeam.

"Well, we intend to raise it, so you had better clear out," said Dave, boldly.

At this there arose a howl of derision from those on the Raven.

"Go ahead and do as you please," came from Lemuel Hankers. "But let me tell you, you have got to have pretty slick divers to get ahead of those I have hired."

"Whom have you?" questioned Captain Broadbeam, curiously.

"I am not afraid to let you know—Cal Vixen and Sam Walton."

At this announcement the faces of Captain Broadbeam, Amos Fearless, and Dave fell.

Cal Vixen and Sam Walton were known to be the best divers on the Pacific coast.

What Amos Fearless and his son had done on the Atlantic shore for the Government, Cal Vixen and Sam Walton had accomplished on the Pacific shore.

"Rivals for fair!" murmured Dave.