This film is based on the true story of the Catalan lawyer and engineer Narcís Monturiol i Estarriol (Figueres 1819 - Barcelona 1885) who invented the submarine.
One day, Pedro Sansinenea left family, friends and country, an environment that drowned him. Twenty years later he returns to the Basque Country for several reasons, where he finds old hatreds, new conflicts and even a dramatic love story.
