Alec Guinness delivers a believable performance as he embodies the central figure in this otherwise somewhat stiff portrayal of Hitler’s final days confined within his Berlin bunker. As Allied forces drew nearer, the leader grew increasingly desperate and agitated, exhibiting heightened suspicion toward those around him. Individuals who had previously held positions of authority were abruptly removed; his outbursts became more erratic, and his emotional state shifted unpredictably to the point where even experienced individuals had to be extremely cautious or risk facing a firing squad. Eva Braun (Doris Kunstmann), his mistress, played a key role in attempting to manage him—though she too encountered considerable difficulties as he perceived betrayal everywhere and confronted the grim reality awaiting her and any potential offspring. A notable ensemble cast features recognizable actors from across international cinema, with Adolfo Celi particularly noteworthy as General Krebs, Mark Kingston portraying the repugnant Martin Boorman, and John Bennett contributing effectively to the feeling of oppressive confinement within the bunker. The sound design is also well-executed, subtly amplifying sound effects to convey the impending arrival of enemies. To offer some visual variety amidst what could have been a repetitive experience, the film incorporates disturbing actual footage that demonstrates not only the suffering inflicted by the Nazis but also Hitler’s willingness to utilize every available means—even his Youth Movement—to maintain control. I believe this story might be more effective as a theatrical production; it struggles to achieve a certain level of intensity on screen, despite Guinness's efforts, and feels somewhat overly detailed, diminishing the impact of the looming danger.

Source on TMDB