Spain has started testing one of its S-71 Galerna diesel-electric submarines that have undergone major repairs and upgrades.
The Galerna is the main submarine in the Agosta-class submarines built by Spain in the 1980s.
Spain has 4 Agosta-class submarines, each is 67 m long and 6 m wide, with a water displacement rate of 1760 tons.
These submarines can move at a speed of 20.5 knots, and has a range of 8,500 nautical miles on each mission.
Each Agosta-class submarine is armed with different torpedoes, including 533 mm torpedoes, naval mines, and SM-39 Exocet anti-ship missiles.