you must done the list,find weapons done the list and escape you always need ammo so when you are low ammo you may need to hide and find some ammo or else.There are a nuclear boom underground you can make it boom or do something with it,there is a big alien underground only ray gun can kill it,there are some notes around area 51.only few staff survive now the solider is coming to save everyone.there is a portal to another world (its a mystery portal test) you may try it and went to another world