The submarine Mackerel (SS-204) of the US Navy.
Technical information
| Type | Submarine |
| Displacement | 825 / 1179 BRT |
| Length | 239 feet |
| Complement | 4 + 34 men |
| Armament | Six 21" torpedo tubes, 12 torpedoes. one 3"/50 deck gun. two .50 cal. machine guns. two .30 cal. machine guns. |
| Max speed | 16 / 9 kts knots (surfaced/submerged) |
| Engines | Diesel / Electric |
| Power | 3360 / 1500 hp. (surfaced/submerged) |
| Notes on class |
All ships of the Mackerel class
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 | Mackerel (SS-204) | |
| | Marlin (SS-205) | |
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US Navy (more on See all Submarine classes.
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