This labyrinth of tunnels and corridors is the last stronghold of Ukrainian fighters in Mariupol

After more than six weeks of fighting, almost all of Mariupol is in Russian hands. The last Ukrainian fighters have entrenched themselves in a large Azovstal metal factory in the port city and continue to resist from there. The complex is a true labyrinth of tunnels and corridors and that means that the Russians will have to go to extremes to take the city completely.

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