With this building gone, you'll gain access to a secret mission.
It can't be targeted with a normal attack, so you'll need to use an area effect attack. While here, send a thor to the south-east corner and destroy the science building. The Dominion will send in back up as you upload to the broadcast tower, but a good number of thors and vikings will subdue them. Once you have a good number of thors, assault the third base and wipe out the defenses.
