Shipping is prohibited within a zone of 500 metres around a platform. ONE-Dyas always conducts several safety studies for new and existing activities, including a study of the risks of collision with ships. The MARIN study, which is appended to the EIA, shows that the probability of a collision with the platform (worst-case approach) has been calculated at 1 / 273 years. All platforms are equipped with an Automatic Identification of Shipping System. (AIS system). This is a type of anti-collision system that raises the alarm well in advance of an approaching ship and thus a possible collision. The use of AIS reduces the chance of a collision, which in the worst case is calculated at once in 273 years, by another 75%.