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FORK
The path forks as soon as you leave the save point. Head north first, dealing with Deathclaws along the way.
BROGAN ADJUSTMENT
Exploring the northern rooms, you'll find a control for one of the electronic doors. You'll have to smash it instead of using it, though. You'll also need to open the door to Computer Lab A by shooting it through a window in this room.
COMPUTER LAB A
Smash all the different parts of the computers and eventually the power will go off, giving you access to the computer lab's other door.
EXIT
Following the path out of the computer lab, you'll find the exit to level three. Explore to the west some more and you'll find a Shop-Tec machine. You still won't be able to open the door to the east of the first save point, so head on to level three.
ALTERNATE GARDEN ENTRANCE
When you've gotten the lab keycard (after defeating the Mother Deathclaw), explore the area to the east of the first save point on level two. You will have to cross a pipe at one point to do this (be careful, it's dark). You'll find an exit that leads straight to the garden, which is a real time saver.