Let's see if I can figure this out.
The United States government, working with the shadowy Izor
corporation, built a giant complex to help them master quantum
mechanics, presumably for military applications. They enlisted the
help of notorious cyber-terrorist Alex Trusk, a blind teenage girl,
to help them with construct it because she's an expert on tesseracts
somehow. When Alex learned they were putting people inside of the
cube to be tested, she tried to expose them only to have them come
after her.
She fled into the cube itself, as she
knew they wouldn't risk their lives to pursue her there. Even though
she knew the entire time entering the cube was a death sentence, so
I'm not sure what she had to gain trapping herself in a place where
she had no food or water. Not to mention if Izor caught her, they
likely would have stuck her in the cube anyway. There's also the
question of how a blind girl was able to enter the cube, as one would
have to think the entrance would be heavily guarded but WHATEVER.
Apparently she had some kind of super
important device with her, so Izor sent Kate, one of their
operatives, into the cube to retrieve it. Kate quickly finds Alex,
only SHE DOESN'T KNOW IT'S HER. WHAT?! Izor, who has the power of
the entire American government behind them, didn't know what Alex
looked like or that she was even female? At the very least, they
don't have video surveillance around their precious cube? Oh my God,
that movie just gets worse the more you think about it. So a bunch
of random bullshit happens, Kate's able to retrieve the device and
escape the cube, only to get shot in the back of the head by her
supervisors. Yay... and stuff.