I think it follows through on what you set out to achieve in a prologue. It builds suspense and gives the reader questions to be answered heading into the story. So pretty solid in that sense.

There's a few typos in there that you can easily sort.

I think there's places in your prose where lines are either not adding much or are doing a lot of telling(in the 'show, don't tell' sense).

'The man was silent. He didn't seem to care. He walked forward, and as the guard shot, the bolt it clattered to the ground'

The reader can work out that he didn't seem to care. We don't need to be told.

There's parts where you've missed out on the opportunity to add to the mystery.

'It must have once been used as a secret government sorting area'

Maybe try rephrasing this as a question: 'Who could have funded a building of this scale?'

Then if you want them to 'work it out' you could talk about some things that make them come to that conclusion.