- [Narrator] On Cobra.

- The situation in London is very grave.

And our attempts to move a new transformer to the red zone, paralyzed.

Without fuel and supplies, people in the worst affected areas will die.

- Word is that some of the protesters are armed.

- I know you understand what's at stake here.

(crowd cheering) - There will be consequences you might not be able to handle.

- You will not break their barricades.

(crowd noise and glass shatters) Your time is up!

- [Narrator] Cobra.

Only on PBS.

(gentle piano music)