HMS Ocean
Media playback is unsupported on your device
Video

London 2012: Olympic security exercise on board HMS Ocean

A large-scale exercise to test Britain's military capability ahead of the Olympics is under way.

A helicopter task-force is on board the Royal Navy's largest warship, HMS Ocean, to prepare for their role in defending London against any potential terror attack during the Games.

The BBC's Defence Correspondent, Jonathan Beale, reports from on board HMS Ocean.

  • 04 May 2012
Go to next video: Net sensation ship returns home