Salvage law in NZ is in a mess. Maritime Act 1994 repealed all salvage related clauses in 1999 but Parliament has not adopted the 1989 International Convention. To salvage those remaining 5 bars of gold would require navigating (pun intended) a whole host of other legal hurdles viz RMA, H&S et al plus marine and resource consents, likely objections from all interested parties such as EDS, DOC, Hauraki Gulf Forum, Iwi, a trip through the Environment Court - Supreme Court pathway, with huge amounts of money chewed up even before one got started. However the environmental law partners at Russell McVeigh and Bell Gully will be very enthusiastic and encouraging of any salvage proposal.