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| | Submarine History 1945-2000: A Timeline of Development |
 | | U-3008, one of only two Type XXI U-boats to make a wartime patrol — albeit brief, as the war ended en route. |
 | | The first Type XXI, U-2511, left Hamburg on war patrol on April 30; when she returned home to surrender, 30 Type XXI were in shakedown and training, 121 were in the water and another 1000 were under construction or on order. |
 | | Type XXI had only half the range of the comparable Type IX, could manage bursts of 17 knots underwater (compared with 7 knots), dive to almost 1,000 feet (300 feet deeper), and remain totally submerged at economical creep speed for 11 days. |
| www.submarine-history.com /NOVAfour.htm (5121 words) |
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