These appear to be designed to receive a signal of some sort. Electromagnetic waves? When triggered, the electrodes... will send a charge converting the chemical into gas. The gas will travel up that shaft and filter through the ventilation system... that leads directly to Parliament. Within seconds... the most powerful men in the world will be choking on death. Blackwood must have some transmitter that he can activate remotely. 3 minutes, 10 seconds.

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Sherlock Holmes (2009)

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Duration: 24.6s

These appear to be designed to receive a signal of some sort. Electromagnetic waves? When triggered, the electrodes... will send a charge converting the chemical into gas. The gas will travel up that shaft and filter through the ventilation system... that leads directly to Parliament. Within seconds... the most powerful men in the world will be choking on death. Blackwood must have some transmitter that he can activate remotely. 3 minutes, 10 seconds.