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.
| Actor | Role |
|---|---|
| AAbel FolkNarcís Monturiol | Narcís Monturiol |
 Jordi BoschMartí Carlé | Martí Carlé |
 Hermann BonnínAntoni Altadill | Antoni Altadill |
 Jaume ComasJoan Monjo | Joan Monjo |
 Josep Lluís FonollAccionista 2 | Accionista 2 |
 Mònica GlaenzelAnna 4 | Anna 4 |
 Joel JoanNot listed | Not listed |
 Pep JovéNot listed | Not listed |
 Lidia PeroyM. J. Massanés | M. J. Massanés |
 Xabier ElorriagaJosep Ll. Xifré | Josep Ll. Xifré |
 Artur TriasJosep Oliu | Josep Oliu |