Nando is a young Galician with a simple life. His perseverance leads him to win the amateur boxing contest but his ambition does not stop there, the reunion with his childhood friends leads him to make a series of bad decisions that will change his future forever.

Nando and Sergio arrive in Brazil, look at the boat in which they will do their new job and realize that luck is not on their side. The pursuit of Carmo and Ortiz continues.

The adventures begin inside the semi-submersible. The crew members of the artifact encounter breakdowns, hunger, storms, etc. A news from Colombia will make everything more difficult for the protagonists. Carmo and Ortiz are getting closer to capturing them.

The protagonists arrive in Galicia, the tension increases while the protagonists try to sink the semi-submersible to flee from the police.

Destino Operación Marea Negra is an extra chapter in the form of a making-off, where the filmmakers and the protagonists open the doors to the second season of Operación Marea Negra and tell us how they have prepared to continue Nando's story. Serving as a bridge between the two seasons, this episode explores the process of making a hit series.