Ukraine's Defense Tactics Head Underground

ABC News' Hamish Macdonald tours the trenches being built in the city of Mariupol as a defense against Russian separatists.
1:17 | 09/01/14

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Transcript for Ukraine's Defense Tactics Head Underground
This is -- network of trenches that they Ukrainian forces the building they've got lots of all and he's here helping them. This trench system finally began construction in the lost few days and already. Then an enormous amount of work or on the ages and Mario pull. The Russian -- persists. Potentially we support from some Russian soldiers I'm pretty close to here. Last week but this effectively becomes the line -- the -- line of defense. To protect the communities yeah. Will you get a pretty good idea when you come down here. At how prepared now to DEA and this is this sleeping quarters and you can hear on the radio above us that the troops. Listening to for a Williams happy seems -- pretty unusual song choice that the front line. He's he's already pretty complex trench system in this concrete structure -- -- -- artillery positions. Everything you might need to withstand the heavy assault. On the city.

This transcript has been automatically generated and may not be 100% accurate.

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