The Russian facility was surrounded by a high, razor-wire-topped chain link fence, which had been simple enough for Remus to slice through with a cutting spell and then seal roughly back together again. They were all disillusioned, creeping along bunched together, supposed to be holding onto each other so they didn't get lost but people kept letting go and whispers cut the air as they tried to find each other again. Hermione could only just barely make out peoples" shapes – shimmers distorting the air ever so slightly. Their presence would be obvious to wizards and witches who knew what to look for, but the bored looking Muggle guards standing around the fence perimeter were utterly blind to the distortions.