Siberian tiger v bear: even David Attenborough ‘wowed’ by Frozen Planet II

The BBC's new wildlife series overcame photography challenges with hi-tech equipment and years of patience

The tension in the air was palpable as the group of television producers waited with bated breath to see what would happen as the Siberian tiger crept into the bear's cave. This was a groundbreaking moment in the making of wildlife documentaries, and one that will be seen by millions who tune into Frozen Planet II.

It took three years of persistence and trial-and-error filming in Russian forests using remote cameras to get the footage of the tigers entering bears' caves, said Elizabeth White - who worked on the original Frozen Planet and produced the award-winning iguanas vs snakes" episode of Planet Earth II.