Sci-Fi book set underwater?

  • Thread starter Thread starter All_Screwed?
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All_Screwed?

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I read this sci-fi book years ago which was set underwater. The main character was the heir to a company or family fortune, and was kidnapped and altered to have gills so he could work at the ocean floor. They had "tamed" sharks used like guard dogs and such. Some of the aquatic people had escaped and established enclaves across the ocean, and after escaping somehow he hooked up with them. At some point it was discovered that the gills did not have to be one-way, and they could breathe above and below water.
Has anyone read this, and remembers the author or title?
 
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