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| | Greater Underwater Propulsion Power Program - Indopedia, the Indological knowledgebase (Site not responding. Last check: 2007-11-01) |
 | | The GUPPY II conversion, from 1947 to 1951, was generally similar to the GUPPY I except for the sail. |
 | | The GUPPY IB program, from 1953 to 1955, was another interim conversion that converted four boats for transfer to foreign navies. |
 | | From 1959 to 1963, this problem was addressed by selecting boats that already had completed most GUPPY II conversion work and were in good condition, cutting them in half, and adding a 15 foot (4.6 m) section forward of the control room to create room for new sonar equipment. |
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