Airport Question!

[Forester]

I amm currently in the airport and have turned on 3 switches and cannot understand what to do now,the questbook says this,``We have to find where the Grand Commendanter hides and hit him with a mortal blow``(I have am unable to open the gates on level -3), any ideas? many thanks!

[Indinera]

this is past global war right?
(all the parties defending adretana)

[Forester]

this is past global war right?
(all the parties defending adretana)

That is correct Indie.

[Indinera]

has luci reached the main computer and used it?
(it triggers quite a long cut scene with her working on the comp while the 3 others defend her)

[Forester]

Yes Indie I have already done the computer sequence with Luci.

[Indinera]

You are on the right track.
You need to go deeper in the Airport but I cannot really provide directions on top of my mind.
All I can say is that there is no trick, just explore and you should find it.