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| | USS Narwhal (SSN-671) - Wikipedia, the free encyclopedia |
 | | USS Narwhal (SSN-671), a unique submarine, was the third ship of the United States Navy to be named for the narwhal, a gray and white arctic whale that averages 20 feet in length, each of the males of which have single, long, twisted tusk. |
 | | Much of Narwhal’s design was based on the Sturgeon class of attack submarine, but her powerplant and engineroom was unlike any other. |
 | | Narwhal was fitted with a "turtleback" structure just forward of her rudder that may have been used for remote-controlled underwater vehicles, or for housing an experimental towed sonar array. |
| en.wikipedia.org /wiki/USS_Narwhal_(SSN-671) (630 words) |
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