(1) A determination under section 68 remains in force for 12 months from the date the notice is published in the Government Gazette, unless revoked earlier by the Executive Director or by the registration in the Heritage Register of the place or object as—
(a) a registered shipwreck; or
(b) a registered shipwreck artefact; or
(c) a registered archaeological place; or
(d) a registered archaeological artefact.
(2) The Executive Director, by notice published in the Government Gazette, may extend a determination under this section for any further period of 12 months that the Executive Director considers necessary.
Division 2—Shipwrecks and shipwreck artefacts