In Area 2 will get you some Singularity Cannon rounds in Magazines, its your choice to see if you want to bring the Cannon with you as its a Risk of losing it before you get rounds to use it, but as you will see I did take the risk and it paid off.
I took a change of clothes to keep the NBC suit in good condition
Keys are all Found at Alien Crash Sites
Good luck
![](https://i.ytimg.com/vi/vAClsqDj9jI/maxresdefault.jpg)