Why couldn't the astronauts get out of the Apollo 1 fire?

The astronauts of Apollo 1 could not escape the fire due to several critical factors. The inward-opening hatch design was difficult to open under pressure and took too long to operate. Additionally, the pure oxygen atmosphere in the cabin fueled the fire's rapid spread, while the flammable materials used in the spacecraft exacerbated the situation. These combined elements led to a tragic inability to escape the rapidly intensifying blaze.