Patrick Schwarzenegger has joined the cast of movie Bunker.

Florian Zeller will direct the film, which already has married couple Javier Bardem and Penélope Cruz attached.

According to Deadline, the motion picture is described as: "A thriller that delves into the emotional and moral challenges a couple faces amid the tensions of the world around them, exploring the fears, doubts, and dilemmas that define our era."

It is set to tell the story of an architect who builds a bunker for a tech billionaire, but the morally ambiguous project leads to his wife questioning their marriage after 17 years.

In May, it was revealed real-life couple Bardem and Cruz - who wed in 2010 and have two children, son Leo, 14, and daughter Luna, 12, together - had joined the cast of the movie.

Florian said in a statement: "I wanted to tell the story of a marriage and was deeply compelled to work with a real-life couple.

"I immediately was drawn to the idea of working with Javier Bardem and Penélope Cruz, two of the most gifted actors working today, who also happen to be one of the most iconic couples. I wrote Bunker for them.

"This film will push the boundaries of narrative and emotional truth, blurring the lines between reality and fiction in a way that feels thrilling and deeply human."

Federica Sainte-Rose will produce for Blue Morning Pictures alongside Fernando Bovaira and Simon de Santiago of MOD Producciones, and Alice Dawson.

What's more, Mariano Cohn, Gaston Duprat, Andres Duprat, Emanuel Nunez and Fernando Sokolowicz will serve as executive producers.

Federica said of the project: "What excites me most about working with Florian on Bunker is the bold new direction he's taking as a filmmaker.

"This project marks a clear tonal shift - unsettling and cinematically daring, Bunker speaks to the glaring contradictions that exist in modern society.

"The exploration of fears of the future, from ecological threats to rising social inequality, makes this film both urgent and relevant."