Patrols on foot, on quad bikes or even in kayaks: on the day of the Ariane 5 rocket launch, up to 300 people from the Guiana armed forces are mobilised to ensure the safety of the launch. The site of the Guiana space centre is huge - 700 km2, more than six times the size of Paris - and in the middle of the equatorial zone, often difficult to access. Postponed the day before, the Ariane 5 launch should finally take place this Saturday evening. IMAGES AND SOUNDBITES