"I was 7 when I first saw the cartoon book, first read it," Cousteau, now 38, said. "It stuck in my mind as a great idea. We went one step further; I didn't want something rigid that didn't move."
Propelled by a wagging tail and covered in a flexible, skinlike material, the subcreated by Cousteau and a team of scientists and engineersswims silently.
The steel-ribbed, womblike interior is filled with water, requiring Cousteau to wear a wet suit and use scuba gear to breathe (see photo).
George Lauder is a professor of organismic and evolutionary biology at Harvard University in Cambridge, Massachusetts. He has not personally seen the shark sub, but said that if the contraption moves as advertised, the team deserves congratulations.
"It is notoriously hard to produce natural-like swimming motions of fishes with robotic models," Lauder commented in an e-mail.
Be a Shark
Importantly, Troy allows Cousteau to be a shark, not shark bait.
At the heart of the project is a desire to observe what great white sharks do when people aren't around to watch.
Prior to this, most shark observations have come from humans sitting in cages and enticing the predators with baitconditions that spawn unnatural behaviors, Cousteau said.
"Now all of the sudden we can see what they do as white sharks rather than as trained circus animals," he said.
While Cousteau is reluctant to guess what the sharks thought when Troy invaded their space, the explorer said they seemed to act naturally (see photo). Some even puffed their gills and gaped toward Troyactions thought to be communication signals.
And though a few sharks made aggressive gestures, none of the predators attacked the shark-shaped sub.
One reason for the lack of attack may be Troy's substantial size, Cousteau said. Fourteen feet (4.3 meters) long and fat enough to accommodate a human, the sub looks like an exceptionally robust, well-fed shark.
"I would imagine that animals that have lived on the planet for over 400 million years are there because they're smart and because they're survivalists," Cousteau said. "Survivalists don't take on unnecessary risks. And attacking another great white shark is undertaking an unnecessary risk."
Given his preliminary success with Troy, Cousteau hopes other researchers will come in and pick up where he left off.
"There's so much more we can learn with the next set of experiments like this," he said.
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