We all know that Kate was sent to retrieve information that Alex Trusk had about Izon and/or the Cube. It seems like they would've given her some info on Alex like the fact that she is blind and Asian? She seemed suprised to find out that Sasha was really Alex Trusk. Or maybe not, because when Kate first found Sasha, she kept hollering "they're coming". Also, it seems like Kate had some info in which the information was contained because before she jumped she knew right where to get the source of the info...Sasha's neck. Sasha's necklace was visible throughout the movie, and if they told her where the info could be found...how come she still acted surprised to find out about Sasha? If anyone can decipher what I am trying to convey (lol), please let me know you insight :-)
I noticed only one funny look that Kate gave Sasha. As far as Alex Trusk, it's hard to grasp that an untrusting company like Izon (ie: killing everyone that knew too much) would even deal with people they don't know about. It's hard to believe that they would even deal with Trusk not knowing nothing about her; especially the slightest detail such as her gender.
Kate probably knew that Alex was wearing the necklace, but she didn't know who Alex was. And hackers are generally not known by their real identity, that's why they had just a little information.
How would Kate not know? She was sent in the cube to retrieve the necklace. Izon obviously put the other people in the cube leaving one person that they didn't put in. Also, how would they not know what she looked like if they were close enough to nabbing her that she fled to the hypercube, basically a one way ticket (even if she did survive the cube).
I think the idea was that after Izon built the hypercube they had no way of controlling/monitoring it from outside without Alex Trusk's help. What I think happened is this : Izon builds the "hypercube" in order to collect valuable information about quantum teleportation (something which actually occurs during the film and which Jerry mentions near the the beginning of it), however the only way they can achieve this is through the brilliant mind of Sasha (who by the way, I don't even think was blind, it was just another mask to cover her true identity, I mean besides the obvious "how could a blind person be the best hacker in the world?" question, there's also the issue of her wearing a regular watch at the start of the film).
However, Sasha figures out that Izon and the military are using all the people connected to the design of the "hypercube"(which is actually a five-spacial dimensional toroid if you ask me) and condemning them to death in order to obtain the data mentioned before, so she decides to take all the recorded data with her and hide in the only place where she thinks the military won't follow her and where the results of the experiment are sure to be destroyed and lost forever.
Left with no other choice, as per my earlier assumption that the only one who could presumably monitor the cube from outside was Sasha, the military sends an operative, Kate, on a "suicide mission" in a last ditch attempt to salvage something from the program and recover the information. But, without the ability to monitor the activity inside the "hypercube" any longer, and perhaps as a result of a degree of memory loss associated with the procedure of being "inserted" within, Kate does not know who Alex Trusk is, nor can she reveal the identity of the hacker through the process of elimination (i.e. she doesn't who all the people she could potentially meet inside the cube are, thus singling out the person who is not supposed to be put in there by Izon).
The way I see it, this explains why Sasha is perfectly at peace with her own demise and why she is constantly encouraging other group members to give up, unknown to her though, that she was followed inside. However, given the extended ending where Kate admits that Sasha was on to her at some point, and the fact that Sasha does expose the recording device around her neck after admitting she is Alex Trusk and presumably realizing Kate's true purpose, Kate's surprised reaction to find out the true identity of her target does seem justified as well as her further determination to not give up and find a way out. And since the experiment was essentially over, the "hypercube" collapsed on itself in the end and maybe they didn't have a way of recreating it without help/or they just weren't interested in doing so, it does make sense to tie up the last loose end by killing Kate, as her experience gained with/surviving the "hypercube" was of no further use to them.
Although I think your guess is as good as mine, I believe there are too many assumptions, perhapses and maybes in your point of view.
There is nothing before the last scene that shows Kate is there for a purpose. The only thing that shows Kate is not all she says, is the moment in the end where Sasha shows the necklace and Kate notices it.
My version to the truth :) Kate is sent in to retrieve the necklace. Just like the rest of them, she fails to remember how she got in the cube. Therefore it might be possible she at that moment doesn't know she is to retrieve anything. Then at last she sees the necklace, knows about Sasha (who is willing to let Kate in on her secret, because it is too late to avoid the end) and it all comes back to her. Grabs the necklace, remembers to get through the hatch at the right moment and ends up in the (IZON?-)facility.
I believe this is closer to the truth, because there is less assumptions, it clears wih things said/ shown in the movie and it ties up with the ending, where she states "with no time to spare", indicating it all ended on a moment previously established, with no way of ending it earlier. To elaborate: I believe they knew it would end at a certain moment, so they wouldn't see Kate before that moment (even if she succeeded early) or not at all. They knew Kate found the way out when the moment had come. This would mean they indeed had no way of monitoring inside the cube.
I watched this movie sort of a while back, but I'm sure I'll review it again in the near future, however I wanted to ask you, did you also see the extended ending ? I'm positive there's like an extra few minutes of film in which Kate tells the IZON guys that at some point Sasha was on to her, or something to that effect. Regardless, I see we both agree on the important points, even though you affirm that I make too many assumptions, it really seems a big deal to me that IZON had no way of monitoring activity inside the hypercube... Anyway yes, the sort of open-ending leaves room for a little interpretation, it sort of makes me wish someone out there would make another cube movie now! :D
I did not see the extended end to this. What I saw, was Kate getting out of the cube to be waited on by some guys. One of them says you found your way out. Replying "with no time to spare". And then she gives the necklace, thus ending phase 2.
I read about Sasha being on to Kate in the boards, but noticed nothing to that extent in the movie.
She knew from the very start that Sasha was Alex. That is why she tried so hard to keep her alive at ALL COSTS. That was her mission. That said, all she needed from Sasha was her necklace, not her.
I'm also not sure if it's just me, but why didn't Kate have a suspicion that Sasha was Alex, even if we're just talking about being on a name basis. Like you said, I'm sure they would have at least wired that information onto Kate, unless it was said somewhere in the movie that Alex lived in seclusion and kept their identity hidden under lock and key.
Our songs will all be silenced, but what of it? Go on singing. -- Orson Welles