6.72. During the pre-operational period, IAEA nuclear safeguards authorities will require information about the original undisturbed site preferably before excavation begins, draft plans of the facility and operations, a description of intended exploratory underground works and general information on the region (e.g. local mining activity). Early access to design information and any pre-existing or baseline data is necessary so that the IAEA can assess nuclear safeguards requirements and suggest any changes to the design that may make it easier to safeguard. This information is also used for the planning of safeguards measures to ensure that they will not compromise the safe construction and operation of the facility.