Re: How did they know everyone left the stardrive section?
I'm sure there's a protocol to be followed. Crewmembers in charge of the evacuation might be responsible for a specific group of people, and once a crewperson sees that their group is all clear, they hit the 'button' to register that their group is safe. Once all 'buttons' have been hit, the stardrive section is confirmed as cleared.
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