"I hear it, too." A high-pitched sound... but right now, Heiji was interested in avoiding the wires. He felt around carefully, but it was dark and it wasn't like he could say anything. When they were about halfway through the room, there was a banging noise in the direction of the door they'd entered from, like something metallic striking a heavy object.

"Light," he said urgently. Robots? "We gotta hurry." And that was exactly what Heiji tried to do, while trying simultaneously not to get hit by a wire or trip over something in the dark.

The sound of a wire stretching taut, then snapping with an audible twang. Something was behind them.