So the alien ship Tet was powered by what, helium-3 they harvested from the water? That's why they were sucking it up? Why did they need Earth resources; aren't these aliens and their advanced ship super advanced, so should be beyond needing Earth resources?
Also, near the end, that montage with Tom Cruise and that other lady in the NASA ship, going towards the Alien object. Was the alien object near Earth then? Because by what the characters were saying, it sounded like the people on that ship had been sleeping a long time or something to get to that spot, to get to the alien object. And why did they keep those people sleeping the back of the ship, and Tom Cruise and the other lady were the only ones awake to approach the alien ship? And earlier in the movie, when Cruise's wife crashed to Earth; why did that happen? If she came from that NASA ship Odyssey, who's approach with the Tet ship I assume happened many years ago, why did it suddenly crash to earth in that particular time Cruise saw it crash? Where was it during all those interval years?
It didn't specifically say they needed the water to power the Tet, that's just my assumption. I think that's digging a little deep. Even though they're super advanced I guess they still need resources. A lot of alien based movies are based upon the idea of aliens needing Earth's resources, but it never tells you exactly what for.
I need to watch again because my memory is bad, but I think they were investigating the Tet and we're meant to assume they take it in turns to sleep or control the ship or something, and at the time they entered the Tet, only Cruise and the woman were awake.
I think the reason his wife came to Earth was because he activated that telephone, which was a Nasa beacon to get the sleep pods to return to Earth. Before they entered the Tet 60 years before, Cruise released that part of the ship knowing they were going to be captured, and the sleeping people orbited Earth for that whole time still in cryo sleep. But I think they said towards the end that the telephone was a beacon to bring it back to Earth.
There's a bunch of plot holes, I know, but there's hundreds of movies and TV shows I could dig up that are full of holes. I just try to enjoy things for what they're meant to be.