Im on the part where you have to grab a scientist and scan him on the green light poll.
but when i go into the gate,these men keep shooting me and if i kill all of them they just
keep coming. and there's also a gl*** wall there with people holding up sign's....how do i
get past this area?

just head butt the gl*** a couple times and the gl*** will break and do the same thing to
the tunnle at the bottom of the aquariam untill it breaks

ihave know idea