After realizing the tunnels were a dead end, probably meant to be if you fell in the water you could get out through the sewer. Otherwise I could not use it. So I had to take out one of the bots as they patrolled the area well. I used an EMP grenade and took one out and then got around the other one without much issue.
I enter the airport terminal and take out the NSF goons, and move through the building finding its secrets. Using the dart crossbow I take out some of them but they keep getting to the alarm before I can subdue them. I ended up hitting one of the guards with three or more darts but they still set off the alarm.
So I had to sneak around and rig the alarm to stun the user. After setting it I guard saw me and all hell broke loose. Luckily my alarm trap took out one of the guards. I tried shooting the other guard in the dick to no avail and had to quick load.
This level took me awhile, kept getting hit by guards from spots I didnt know they would hide. I wonder if this was changed from the original game. Though I remember as teen placing this game it was pretty hard so probably.
