The final, desperate hours inside the Berlin Führerbunker
As the Red Army closed in on Berlin, Adolf Hitler retreated into an underground refuge. Amidst the sound of heavy shellfire, the dictator prepared for a final act of self-destruction, leaving behind a trail of eyewitness accounts that would later debunk rumors of his escape.
By April 1945, the collapse of the Third Reich was nearly complete. Approximately 2.5 million Soviet soldiers had reached the German capital, and within two weeks, fighting had moved to within a few hundred yards of Hitler's bunker. The atmosphere inside the refuge was one of profound gloom, as the sounds of artillery echoed through the underground complex.
In the final days of April, Hitler engaged in several significant personal acts. During the early hours of April 28–29, he dictated his political and personal testament to his secretary, Gertrud "Traudl" Junge. Shortly thereafter, he married his mistress, Eva Braun. Witnesses, including secretary Gerda Christian, noted that while Hitler spoke of happier times during a wedding celebration, he admitted the war was lost and expressed his intent to commit suicide to avoid capture by the Russians.
The news of the execution of Mussolini and Claretta Petacci by Italian partisans on the morning of April 29 further solidified Hitler's resolve to avoid a similar fate. Following these events, he ordered his staff to prepare for the end.
In the aftermath of the war, rumors circulated that Hitler had escaped. In June 1945, the Soviets even falsely claimed his remains had not been found. To counter these claims, British intelligence officer Hugh Trevor-Roper used interrogations of Hitler's personal staff to investigate the circumstances of his death, eventually publishing his findings in 1947.
Source: What Really happened to Hitler in the Bunker