4. At the request of the verifier, the company concerned shall provide any additional information that enables the verifier to carry out its verification activities. Where necessary to determine the reliability, credibility, accuracy and completeness of reported data and information, the verifier shall conduct checks during the verification process. In case of doubt, the verifier may conduct site visits at the premises of the company or on board the ship. The company shall allow the verifier to access the premises of the company or the ship in order to facilitate the verification activities.