Bunker is an upcoming psychological thriller film written and directed by Florian Zeller. It stars Penélope Cruz, Javier Bardem, Stephen Graham, Paul Dano, and Patrick Schwarzenegger.
An architect's marriage is tested after he accepts a project to build a bunker for a billionaire.
The film was announced on 1 May 2025, and was presented at the Marché du Film later that month. Writer-director Florian Zeller stated that the film The Man Next Door, directed by Bunker executive producers Mariano Cohn and Andrés Duprat, was a source of inspiration when writing the film, which features some Spanish dialogue.
Zeller wrote the film specifically with actors Penélope Cruz and Javier Bardem, who are married in real life, in mind; they were announced as cast members on 1 May 2025. Stephen Graham was announced as a cast member later that month, on 16 May 2025. In November 2025, Patrick Schwarzenegger was announced as a cast member. In December 2025, by the time Bunker was in its second week of filming, Paul Dano was also reported to have joined the cast.
Principal photography began in December 2025. The film was shot primarily in Madrid, with a week of production also taking place in London. Filming was completed by 9 February 2026.