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| | Tang class submarine |
 | | Construction and delivery followed without significant difficulty, but when the boats went to sea in the early 1950s, the new engines did not work well. |
 | | Accordingly, in 1957 and 1958, the first four Tangs were lengthened, while Gudgeon and Harder, still in the ways, were built to the new length, with the new engines. |
 | | In 1967, Tang (SS-563), Wahoo (SS-565), Gudgeon (SS-567), and Harder (SS-568) received an additional 15-or-18-foot section added to receive the PUFFS passive sonar installation. |
| www.guajara.com /wiki/en/wikipedia/t/ta/tang_class_submarine.html (530 words) |
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