The British Organizes say they have installed a secret device to control and regulate the march in by athletes so that they do not delay the opening day proceedings, in which 204 teams are taking part.
The secret device is being kept secret, but IOC's Games Executive Director Gilbert Felli told the reporters: "We have a secret device. You will see, it is a secret and I can't tell you now."
In the meantime, the Oscar winning film maker Danny Boyle asked some 30,000 spectators watching rehearsal not to post details or photos on social networks of his extravaganza, reports Reuters.
So what is the secret device and how the organizers intend 'controlling' the march-in and what 15,000 performers are going to perform Friday on the opening ceremony of the London Olympics, remains a secretly guarded secret.
Let us see how far the organizers are able to control the show.