After taking a hit from a Borg tactical cube with their shields down, the Voyager crew repairs the hull breach. How were they able to repair it and so quickly? I think it was even repaired later in that episode.
The Voyager suffers a significant number of major hull breaches during its seven seasons in the Delta Quadrant. The typical chain of events appears to be:
- A hull breach is detected (invariably during a firefight, but not always)
- Force-fields seal off the affected area, preventing atmosphere loss
- Repair teams are sent to fix the problems
- The repair crews fix the breach from the inside out, presumably using a mixture of pre-made panels and replicated parts.
Janeway: There's a hull breach on deck four, forcefields in place, repair crews on the way
JANEWAY: Be ready to seal the hull breach with a force field. I'll have a damage control team standing by for repairs. And let's track it on sensors when it gets out
I see no reason why this shouldn't be the case in this episode as well. There's no clear indication of quite how long they spent repairing the ship although we do have a scene in which we see the crew putting the bridge back together and testing the shields and sensors.