He asks Sam 1 to move the model so that he can look beneath it. Sam 1 refuses. Things get physical, and Sam 2 becomes uncomfortable since Sam 1 is holding a small knife. They fight for control over the knife. Sam 2 beats up Sam 1 and destroys the model. He looks underneath it but finds nothing. Sam 1 talks with GERTY about the other Sam. He's scared of him since he's got a short temper.
He's also upset that the model is destroyed, since he spent a lot of time on it. GERTY reveals that both Sams are in fact clones. After the three year contract expires, a new Sam is awakened in the infirmary with implanted memories of Sam's family. They also have implanted memories of being on the base for a little while and being in an accident (to explain why they're in the infirmary).
GERTY then conducts tests to evaluate their physical and mental states before they go to work. Sam 1 breaks down upon learning the truth. GERTY tries to comfort him, but he walks away in silence. Later on, Sam 2 tries to apologize to Sam 1, but he plays music and dances. Sam 2 realizes that GERTY was supposed to keep him from finding Sam 1. When the rescue team arrives, they will see them together and will be forced to kill them both.
He also thinks that since the satellite is not being jammed from within the base, it must be caused by something outside. Sam 1 and Sam 2 get suited up and drive the rovers outside. They pass the perimeter of the base, which Sam 1 has never gone past before. They split up to look for anything unusual around. They each come to different towers that have been used to block live feed to the base. Sam 1 drops to his knees and vomits blood in his helmet.
He goes back to the base and vomits more blood into the toilet. He also finds that a tooth has fallen out. While Sam 2 continues to search for more towers, Sam 1 goes to the main computer of the base. He tries to access his contract, but his password is denied. GERTY enters the right password and Sam 1 reviews tapes from previous clones. It seems that at the end of each contract, the clone gets increasingly sick (bad coughs, hair falling out, etc.).
Eventually each clone is put into a chamber, where they are told that they will be put in a cryogenic sleep before returning to Earth. However, all the clones are shown to die once their three years are over, being frozen, and then incinerated. Sam 1 goes to the room where the cryogenic chamber is and activates it.
A recorded video from Lunar Industries plays, stating that the company is successful due to hard workers like Sam and they tell the clones to think of the work they've accomplished as they go to sleep. After the message, the chamber flashes brightly, incinerating everything inside. Sam 1 finds a hidden compartment in the room and breaks it open.
Sam 2 comes back to the base, having found more towers outside the perimeter and writing down their coordinates. The two Sams enter the compartment and find that numerous clones are being kept there. Sam 1 takes a portable video link and asks GERTY why he helped him before with the password. GERTY states that his main priority is Sam's well-being. Sam 1 suits up and goes outside again. Once he drives far past the towers, he calls his home.
A teenager (Kaya Scodelario) answers and Sam 1 blocks the camera so that she can't see him. He asks if Tess Bell is there. The teen says that her mother Tess has been dead for a couple of years. Sam 1 realizes that he's talking to his daughter, Eve. He doesn't quite know what to say, and then he hears the real Sam Bell in the background (who has been alive and well on Earth). Sam 1 quickly hangs up and breaks down, wanting to go home.
He goes back to the base, where Sam 2 is trying to make a shank out of wood (so that they can defend themselves against the rescue team). Sam 2 sees that Sam 1's health is deteriorating. Sam 1 says that he's freezing, and so Sam 2 helps him into bed. Sam 2 finds the video link in Sam 1's bag and replays the last call. He stops it in shock after hearing of Tess's death.
Sam 2 tells GERTY that they've found the clone room, and he wants him to wake up another clone. GERTY refuses. Sam 2 makes him understand that when the rescue team gets there, they will kill him and Sam 1. Looking out for their well-being, GERTY complies with the request. Sam 1 wakes up and finds an unconscious clone in the infirmary. Sam 2 informs Sam 1 that he has come up with a plan. The rescue team will be there within a few hours.
They will expect to find a Sam inside the crashed rover. Sam 2 will kill the new clone (aka Sam 3) and then they will put his body in the rover. Since Sam 1 did his time, Sam 2 will put him in one of the rockets and send him back to Earth. Sam 2 will then act like he doesn't know anything and pretend that he's been inside the base the entire time. Sam 1 doesn't like the idea.
He knows that they can't murder Sam 3 because they dont have it in them to kill. He also knows that he will die before reaching Earth. Sam 1 makes a change in the plan, he will be put back into the rover, Sam 2 will be sent home, and Sam 3 will remain on the base. Sam 1 tells Sam 2 to travel when he gets to Earth. Sam 2 thinks about going to Mexico or Hawaii. Sam 2 and Sam 1 suit up and go out to the crashed rover.
They talk fondly of Tess for a little while. Sam 2 carries the extremely weak Sam 1 back to the rover and places him inside. They say their goodbyes and Sam 2 closes the hatch. Sam 2 goes back to the base to find that the rescue crew will be there in minutes. He packs up some belongings and prepares to leave in the rocket when GERTY points out that the plan will not work. GERTY records everything once a clone wakes up in the infirmary.
Lunar Industries can scan his memory and learn about the two clones interacting & their plan. Sam 2 will have to erase GERTY's memory. He tells GERTY that he will shut him down, and as soon as the rocket is fired he will be rebooted with a clean memory. He thanks GERTY and says goodbye before shutting him down. The rescue crew arrives, while at the same time Sam 2 rushes back to the main computer and enters a command.
He then runs back to the rocket and is launched back to Earth. Sam 1 sees that Sam 2 was successful and dies inside the rover. The rescue crew finds the crashed rover and begins to work on the damaged harvester. GERTY is rebooted and tends to Sam 3, who has just woken up. We see that before Sam 2 left, the command he entered destroyed the towers outside the perimeter, allowing Sam 3 to have a live feed with Earth.
The film ends with Sam 2 traveling towards Earth. We hear a voice-over saying that Lunar Industries stock has dropped 32% so far as a result of the (presumed cloning) controversy that was leaked to the press, that Sam 2 is going to testify at a CAA board of directors hearing in Seattle, and then a goverment radio talk show host arguing that Sam 2 is either crazy, or an illegal immigrant, but either way should not be taken seriously.
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