They step out of the TARDIS near the base of the stone building we saw earlier. "Behold, a cockerel!" cries the Doctor at the sight of a poultry-themed weather vane. "Love a cockerel!" Who doesn't? He pronounces the building a 13th century monastery. Amy seems pleased to have landed in Medieval times, but the distance strains of a Dusty Springfield song seem to conflict with that. The gang has a look around and fined a muddy hole in the ground with a pipe running through it. "DANGER CORROSIVE," warns the pipe. The Doctor deducts that the pipes was exposed when a "magnetic quake" hit just before the tsolar tsunami. He sonics the pipe. "It's a supply pipe, ceramic inner lining. Something corrosive." Yes, hence the writing on the pipe. Silly Doctor.
They go have a look at the monastery. As they're bounding up the stairs, the Doctor says, "I think we're here; this is it." This causes the companions to wonder if they came here by accident. The Doctor's kind of jittery and all "Of course by accident!" but he's always kind of jittery so it's hard to tell if he's nervously hiding something. Rory touches a stone wall and burns his fingertips. "They're pumping acid off this island," the Doctor says. "That's old stuff. Fresh stuff and you wouldn't have a finger." Have these people never watched The Simpsons? If you go traveling through time, don't touch anything. Partly because it will give your children lizard tongues but also because everything might be coated in acid. Where were we? Oh, yes! An alarm sounds. "Intruder alert!" The Doctor tells them that people are coming... almost. Almost coming? No, almost people!