3 Subject
to the provisions of paragraph 4 of this regulation, any discharge
into the sea of oil or oily mixture from the cargo area of an oil
tanker shall be prohibited while in a special area footnote.
4 The
provisions of paragraph 3 of this regulation shall not apply to the
discharge of clean or segregated ballast.
5 Nothing
in this regulation shall prohibit a ship on a voyage only part of
which is in a special area from discharging outside the special area
in accordance with paragraph 1 of this regulation.