By way of derogation from Articles 4, 5 and 7, the competent authority of a Member State may, subject to national provisions, allow, under exceptional circumstances, an individual ship to enter or leave a port or offshore terminal or anchor in an area under the jurisdiction of that Member State, when:
((a))
an oil tanker is in difficulty and in search of a place of refuge;
((b))
an unloaded oil tanker is proceeding to a port of repair.