Pandora's gate is a massive prison complex run by the Mykarian race, dimensional disturbences are common around this area. In addition to prissoners, Dangerous items and disturbances are trapped here. Any race can contribute an inmate.
Pandora's gate's first defenses is rapidfire railgun turrets, with around 300 of them. Nuclear Warheads are used if nessecary. Antimattter bombs are the third line of imediate defense. The actual space station is made out of Nanodiamond (sorry if im not allowed) With reinforced steel plates diretly below that. Mykarian fighters are released as an additional defensive measure.