What happens to Amy?

Space and Time Comic Relief Special 2011

Amy is trying to get the Doctor's attention while he fixes the TARDIS. She discovers that her husband Rory is helping the Doctor by installing thermal couplings underneath the glass floor of the TARDIS. Rory and Amy then start a small argument about Amy cheating when she took her driving test, when the TARDIS suddenly shakes and the lights go out. The Doctor asks Rory if he dropped a thermal coupling, which Rory admits to and apologises for doing. Amy then apologises as well and, at the Doctor's confusion, explains that Rory was looking up her skirt through the glass floor when he dropped the thermal coupling. The Doctor then notes that they have landed through "emergency materialisation" which should have landed the TARDIS in the safest space available. The lights come on, revealing another TARDIS inside the control room — the TARDIS has materialised inside itself. The Doctor experimentally walks through the door of the TARDIS inside the control room and instantly walks back into the control room through the door of the outer TARDIS. The Doctor tells Rory and Amy that they are trapped in a "space loop" and that nothing can enter or exit the TARDIS ever again. Despite the Doctor's words, another Amy Pond enters through the TARDIS door...