When the Doctor gets to the room, he finds Minin trying to get in the glass cage, but manages to trap himself in the space between the two doors, with no way back to the Doctor, and unable to get through to Georgi. The Doctor tries to use the sonic screwdriver, but it melts the keypad. They manage to rip it out, but the inner door only opens a few inches and then jams. Minin tries to fire a warning shot, or just wound him, but ends up shooting a canister of deadly gas behind Georgi. The old man is killed, and the gas is seeping towards Minin who is trapped. The father of Pavel Vahlen (the boy who was killed at the start) brings his toolbox and reluctantly helps Minin out of the Clean Room.