"We will try to prevent them from seeing us. However, if they do, I suggest a retreat in as good order as we can manage. If they should catch up with us, we will bluster and bluff our way on the basis that we were only diving to see if they were trying to search our wreck."

Scotty laughed. "Turn their own table on them. That's very good, Professor."

"I'm glad I'm not a physicist," Tony said piously. "We archaeologists aren't half so devious."

"I am acting in my capacity as a former consultant to JANIG, and not as a physicist," Zircon retorted with dignity. "You will refrain from casting aspersions on my profession, Doctor Briotti."

"My apologies," Tony said, grinning. "In other words, the man is devious, but the scientist is not."

"Exactly. Well, shall we go?"

Rick was glad to get into the water. The camera in its underwater case was heavy in air, but weighed only a few ounces in water. He swam with face mask under, breathing through his snorkel and letting the camera hang.

They crossed the reef without difficulty, then turned to swim along it. The trough just seaward of the breaking point of the waves was the most comfortable swimming position and they went in single file, Zircon leading.

Every now and then Rick looked up. They were getting near the boat, he thought. Perilously near. The boat was anchored just inside the reef, and he could see activity on its deck. Apparently the frogmen had returned from their first dive and were changing tanks.

Zircon stopped swimming and lay motionless in the water. Rick drew abreast of the big scientist, and Tony and Scotty stopped behind them. As they watched, suited figures with belt lights and back tanks climbed down a ladder into the water. A third man, on deck, lowered something to them. It was hard to see, but Rick thought it had a golden glisten and that it was round, about the size of a basketball. The frogmen took it and went under.