Use the scroll bar below to move through the timeline and click on the bars for more information on the classes shown, or select a class from the dropdown list below.
Key
Featured Boat
| Umbra (P35) | |
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| Built By: | Vickers (Barrow) |
| Build Group: | U Group 2 |
| Fate: | Scrapped in July 1946 at Blyth. |
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