Ianto knew exactly what the sound was. It was the worst in the Universe, according to him. He saw the past in his head. Lisa being taken by the Cybermen; Lisa being converted to a Cyberman, screaming in agony; Lisa attempting to kill his colleagues. He saw her skin, half converted before him. Her soft, human cheek, and then at her temple, the cold, hard metal.
Jack went into think mode. He still couldn't bear looking at Ianto. He knew how much he had suffered. What was the Cybermen doing here?
Owen was feeling kind of impatient. His eyes rested on the Captain. "So, if you don't mind me asking Jack, but why are we waiting?" he got shushed by Jack, holding a finger up in front of himself. Owen rolled his eyes at Jack, only to get caught by Toshiko, looking disapproving at him. Gwen on the other hand, had observed the scenario, and smirked at him.
Toshiko had fallen into her role of logical thinking. Cybermen were creatures from a parallel universe, and they had one goal only; to delete emotions, and everyone who crossed them. So far, the Doctor had had them away from reality, but how had they come here? She was thinking about teleport, when she heard a scream; A high-pitched scream in agony. They all looked up at once; leaving Gwen to say everyone's thought. "They have a human, they must be converting!" the screaming got higher and a buzz were heard. The scream cried out in pain. The team started moving their way down the two staircases. Two on the left staircase, three on the right one. On the floor, they all drew out their guns, cocking them and aimed out everywhere in the room.
There wasn't much light. Cybermen footsteps could be heard the same place where the scream died out before. A distant Cyberman voice was heard; the team was unable to hear what it said. Jack turned around to his team. "All right, Toshiko, Owen. You're gonna find out what they're doing here. I want your logical explanations, theories, hypotheses, anything." He turned his head to Gwen and Ianto. "You two – with me. We're gonna kick them back into hell." was all he said in his American accent.
Jack turned, knowing Ianto would notice behind him, how his coat swirled after ham. He walked with long, determined steps, approaching the danger. Gwen, Ianto and Jack hid behind some cold metal boxes when they saw a Cyberman walking by them, in all its shining glory.
They waited until the stomping had faded, and Jack checked if there was any danger ahead, and started walking further into the room. He had a really bad feeling, when they turned the corner. And he was right. The sight was horrific.