 The read-through for "Cold War" took place on 6 June 2012, with filming beginning on 13 June. For the submarine setting, the cast would be sprayed in between every take. The scenes in which the characters are drenched in water were achieved by constantly pouring "gallons and gallons of water" on the cast. Coleman found the experience fun, while Smith said that it made acting easier. Coleman said, "The whole make-up process was reversed as they would damp us down in the morning and rub my mascara off!" For the shots of the submarine in the ocean, a model was used. It was suspended upside-down with "shredded feathers" blown at it to give the effect of being under the sea.
