There are currently over 2,600 workers on site. As a thank you, they will all receive a free breakfast on site for the achievement.

ODA Chairman John Armitt said: "To complete a million hours without a reportable accident on a project of this size and complexity is challenging enough, so to do this five times is a real accomplishment.

"The ODA and all our contractors are dedicated to setting the highest standards and providing the very best working conditions, however this achievement is really thanks to the professionalism of every individual worker on the site."