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I am interested to learn more about the Apollo Docking System. I know that the CM has a Probe that docks to the LM's Drogue. After these two components meet, twelve latches form a solid connection between the two modules, at which point the crew removes the probe and drogue to create a wide open tunnel between the two craft.

When it is time to undock and send the two LM crew to the surface, the probe and drogue must be reinserted to the docking interface. Do the probe and drogue also serve as the airtight seal to the top of each module, or is there a separate closure for those? That is, if the probe/drogue were not reinserted, would the CM/LM have a gaping hole left in the roof?

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After docking, the probe and drogue were within an airtight cylinder formed by the mating of the docking ring on the command module and the tunnel on the lunar module. At each end of the cylinder was a hatch. One hatch on the command module, one hatch on the lunar module.

The layout was like this:

enter image description here

The probe and drogue were not an airtight seal at any point. That functionality was provided by the hatches and by the interface between the docking ring and lunar module tunnel.

Source: Apollo Experience Report: The Docking System

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