Friday 13th July 2012 Operation Olympics, HMS Ocean takes her place on the River Thames in preparation for London 2012 Olympic Games security operation Stock Photo - Alamy

Download this stock image: Friday 13th July 2012 Operation Olympics, HMS Ocean takes her place on the River Thames in preparation for London 2012 Olympic Games security operation. - CMBXX9 from Alamy's library of millions of high resolution stock photos, illustrations and vectors.

London 2012 Olympics: HMS Ocean moors on the Thames for security operation

London 2012 Olympics: HMS Ocean moors on the Thames for security operation

London 2012 Olympics: HMS Ocean moors on the Thames for security operation

Thames exercise prepares Marines for Olympic security role

London 2012 Olympics: HMS Ocean moors on the Thames for security operation

Policing operation hi-res stock photography and images - Alamy

Security forces at London Olympics 2012

London 2012 Olympics: HMS Ocean moors on the Thames for security operation

Royal Navy's largest warship sails down the Thames as armed forces put on show of strength for Olympics

London 2012 Olympics security: Special forces give a show of strength on the Thames

The biggest ship in London! HMS Ocean heads up the Thames in show of strength before the Olympics (as Defence Secretary warns: 'We would shoot down a jet if necessary')