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'Podcam' shows life of dolphins in BBC Spy in the Pod series

30 December 2013 Last updated at 11:21 GMT

Film-makers have infiltrated the ocean with secret cameras to capture dolphin behaviour in the wild as it has never been seen before.

They enlisted a menagerie of creatures, such as a molluscs, sea turtle and squid, with hidden lenses to get up close and personal for a new BBC natural history programme.

The series director John Downer and producer Rob Pilley spoke to BBC Breakfast.

Dolphins - Spy in the Pod begins on January 2 on BBC One at 8pm.