There is a secret one.

To access it in the mission "Media Blitz" (which is the one where Tychus control the Odin and you have to control the 3 news towers to do a broadcast) you have to destroy one Science building south-east of the map.
By default I couldnt attack it but I forced it by using A then click on the building.

Once you destroy it some "secret documents" appear there, collect them using a ground troop.

Then next time you reach the Hyperion you will be able to access that special mission.

I think that if you missed that mission during the campaign you have to redo the campaign or reload a save at that time.
Replaying Media Blitz from the mission archive does not work