125th birthday of the Isaac Peral Submarine

September 2013 was the 125^th anniversary of the launching of the submarine created by Isaac Peral in 1888. To mark this event, we produced a leaflet explaining how he built it, we described some of its characteristics and we explained how this inventor revolutionised the history of military navigation by devising the first vessel to be propelled electrically and which, furthermore, incorporated a torpedo boat under the sea.