Halfway along the passage was a door leading off to the right. Cassidy opened this door, revealing a closet-like room with a box in its centre. On the box rested an ancient appearing iron chest, some twelve inches long and twelve inches square.
"What's that?" asked Matt.
"Can't ye tell by lookin' at it?" cried Cassidy. "Why, that's the iron chest that all this pother has been about."
"I knowed dot!" breathed Carl, from behind Matt, "I hat some feelings in my pones dot dere vas a chest like vat der baper say."
"Where did the chest come from?" continued Matt.
"From the cave on Turtle Key," explained Cassidy. "Jurgens went there an' got it. We was on our way north ag'in when Jurgens sighted that white flag o' your'n through the periscope an' put in at the island to investigate."
Cassidy laughed.
"Ye can see what that investigation cost him," he finished. "He lost the Grampus, and the iron chest. Motor Matt and his mates, by recapturin' the Grampus, got the hull bag o' tricks for the old man. Mebby he won't be tickled!"
"Wished I was Motor Matt," sighed Burke. "The old man's rich, an' he's allers full o' gratitude when any one does anythin' fer him."
"He can't do anything more for me than what he's agreed to," declared Matt, "and that is to pay my pards and me five thousand for the use of the Hawk."