As a mist set in and the sea began to swell, British and Argentine warships circled one another off the coast of the Falkland Islands. Yet hidden beneath the waves, HMS Conqueror - a Royal Navy nuclear submarine - stalked the packed decks of the Belgrano. This pivotal day 40 years ago witnessed one of the key turning points that shifted the course of the Falklands War.

In this second instalment of a new miniseries from Warfare focusing on that very conflict, James is joined by Sir Lawrence Freedman - official historian of the Falklands War - to find out more about the crucial moments that led to Britain's victory in 1982.

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