Corrected entry: Shatterdome was hit by the EMP blast and lost electricity with Gipsy Danger inside, meaning that the massive hangar doors can't open, but somehow they were able to deploy Gipsy despite the Shatterdome having no electricity to open the doors.
Roman Curiel
1st Aug 2017
Correction: There could be an emergency mechanical door to allow them to exit in case of a power outage.