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Trained for espionage? TheÌýmystery of a beluga whale and the murky world of marine spies

One man's hunt for truth about Sandra Rivett's murder. Is the case about to be solved?

Voyage into the unknown. Brian Cox reveals strange worlds visible to us as never before

A divisive debate. Who and what has made immigration so hard to handle for government?

The gruelling reality of war by Welsh Guards who served on the frontline in Afghanistan

David Olusoga sets out once more to uncover the history of a single house in Leeds.

Professor Brian Cox sets off on an interstellar quest for answers that define our destiny

Its myths and legends. Exploring the city that shaped a world – and what tore it apart

The prosecution of a president. Judges, jurors and witnesses prepare for an historic case

High stakes for prisoners – and victims. A close-up look as futures hang in the balance

Professor Brian Cox asks where it all began and how we found our place in the universe

Giles Coren and Monica Galetti explore the most extraordinary hotels across the globe.