"What is the deal?"

"You do as I say," said Hallet significantly. "Just as I say! Then ..."

The lock-door opened, some distance away. Hallet stood up and said in a commanding tone;

"Keep your mouth shut. I'll tell you what to do and when."

He put on his helmet and turned on the phone once more. He went toward the lock-door. Moran heard him exchange words with Harper and Brawn, back with empty bags to fill with crystals worth many times the price of diamonds. But diamonds were made in half-ton lots, nowadays.

Moran followed their bags. He was frowning. As Harper was about to follow Brawn, Moran almost duplicated Hallet's gestures to have him remove his helmet.

"I want Burleigh to come next trip," he told Harper, "and make some excuse to stay behind a moment and talk to me without the helmet-phones picking up everything I say to him. Understand?"

Harper nodded. But Burleigh did not come on the next trip. It was not until near midday that he came to carry a load of treasure to the yacht.

When he did come, though, he took off his helmet and turned off the phone without the need of a suggestion.

"I've been arranging storage for this stuff," he said. "I've opened plates between the hulls to dump it in. I've told Carol, too, that we've got to do a perfect job of cleaning up. There must be no stray crystals on the floor."