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| History | |
|---|---|
 United States | |
| Builder | Martinolich Shipbuilding Co., San Diego, California |
| Laid down | 18 November 1951 |
| Launched | 29 August 1952 |
| Commissioned | 15 July 1954 |
| Decommissioned | 12 December 1991 |
| Reclassified | MSO-449 on 7 February 1955 |
| Stricken | 18 March 1992 |
| Homeport | Long Beach, California |
| Fate | Scrapped, 4 December 2000 |
| General characteristics | |
| Class and type | Agile class minesweeper |
| Displacement | 620 tons |
| Length | 172 ft (52.43 m) |
| Beam | 36 ft (10.97 m) |
| Draught | 10 ft (3.05 m) |
| Propulsion | Four Packard ID1700 diesel engines, two shafts, two controllable pitch propellers |
| Speed | 16 knots |
| Complement | 74 |
| Armament | one 40 mm mount |
USS Impervious (AM-449/MSO-449) was an Agile-class minesweeper acquired by the U.S. Navy for the task of removing mines that had been placed in the water to prevent the safe passage of ships.
Impervious was launched by Martinolich Shipbuilding Co., San Diego, California, 29 August 1952; sponsored by Miss Mary Lin Moore; and commissioned 15 July 1954.