Here's a breakdown:
* The Hatch: The hatch was a large, circular door that sealed the LM from the vacuum of space. It had an internal hatch that swung inward and an external hatch that swung outward.
* Entry Process:
* The astronauts would first open the external hatch of the LM.
* Then, they would climb through the opening, using handholds and footholds inside the hatch.
* Finally, they would close and seal the internal hatch.
This process was crucial for maintaining the LM's internal atmosphere and protecting the astronauts from the harsh environment of space.
Important Note: The astronauts did not enter the LM through the bottom "legs" as some may think. These legs were designed for landing and were not meant for access.