With the Russians poised to launch an attack on Britain's communications from a stealth submarine in British waters, Lucas and Kachimov are inside the Russian embassy attempting to download the submarine's access codes. Will they be able to get the codes to Harry in time and prevent the attack which would see social and economical chaos in Britain? Dramatic clip from the BBC thriller MI5. Watch more high quality videos on the BBC Worldwide YouTube channel here: http://www.youtube.com/bbcworldwide
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