Royal Navy warship HMS Ocean has arrived in London to take part in security drills ahead of the Olympics.
The ship completes the military presence in London for Operation Olympic Guardian.
Typhoon jets have also been stationed at RAF Northolt, puma helicopters are operating from Ilford, and ground based air defences are being tested with dummy missiles at six sites across London.
The Royal Navy's largest warship, HMS Ocean, sailed up the Thames today as the military stepped up security preparations for the Olympics.
The appearance of fighter jets in the skies over London will mark the start of an extraordinary Olympic test event.