Docking was a delicate maneuver, since both ships were traveling at nearly five miles per second, but the docking mechanism itself was one of the simplest on the entire spacecraft, and the docking procedure had been perfected on previous Apollo flights, none of which experienced any significant problems with docking.
When Deke Slayton and Stu Roosa arrived at pad 34 they saw ambulances waiting in vain at the base of the launch tower. They boarded the small elevator and rode to level A-8, 218 feet up, and headed across the swing arm to the clean room…
Exterior of the Command Module was blackened from eruption of the fire after the cabin wall failed
Interior of Apollo 1 Command Module after the fire
Apollo 1 Environmental Control System, located in the forward section near the floor. The fire may have started in this area.