"No-o-o-o," agreed Terry. "It wouldn't. But we'd set off a bomb down below to stir things up. A couple of hours later the bathyscaphe went down. A stupid and merely ferocious thing of the depths wouldn't associate a bomb that exploded with a bathyscaphe that came down two hours later. It took intelligence to make the association of two falling objects with danger."

Deirdre beamed suddenly.

"Of course! That's it! Go on!"

"Curiosity implies intelligence," said Terry carefully, "and intelligence is a substitute for teeth or claws. We don't assume that the fish that carry the plastic gadgets made them. Why assume that whatever attacked the bathyscaphe did it of its own accord? We believe that something else makes the deep-sea fish come up into the Thrawn Island lagoon, don't we? Or do we?"

"We pretend we don't," said Deirdre.

Davis nodded reluctantly.

"Yes, we pretend we don't," he agreed. "But if intelligence is involved, I find myself getting frightened! We humans are always terrified of strange types of intelligence, anyhow. If it's intelligence that isn't human ..."

Nick came up from below.

"Thrawn Island calling," he reported. "They say the hum at the lagoon opening stopped for some forty-odd hours and then started again. They ask if we're coming. I said we were on the way. They're standing by. Anything we should tell them?"

"We'll get there some time after sunset," said Davis. "And maybe you should tell them about the Pelorus and the bathyscaphe."