In a 500-metre zone around a platform, shipping is prohibited. ONE-Dyas always conducts multiple safety studies for new and existing activities, including an investigation into the risks of collision by ships. MARIN’s study, appended to the EIA, shows that the probability of a platform collision (worst-case approach), has been calculated to occur once every 273 years. All platforms are equipped with an Automatic Identification of Shipping System. (AIS system). A kind of anti-collision system, which sounds an alarm well in advance of an approaching ship and thus a possible collision. The use of AIS reduces the chance of a collision, which for the worst case scenario is calculated at once every 273 years, by another 75%.