I think MCM has gone beyond a manned vessel flogging along in a minefield popping in divers whenever they see something interesting.Nocookies
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I am not sure why these two ships need to be sold. They probably aren't worth very much and could easily just be left in mothballs or used as parts for the other four ships.
Minewarfare seems to be the unsexy part of the navy and perhaps it is being somewhat neglected. Now that the decisions on the new subs and frigates are out of the way some more time and effort will be spent on developing Australia's mine-hunting capabilities.
The RAN has upgraded four of the class and only has manning approval for that number. It has also announced substantial funding for remote vehicles and quite a substantial contract was let to Steber for this some time this year.
As far as a sale for the remaining two, their hulls will be in great condition, GRP only gets stronger with age (a pearling company I previously worked for has just sold a GRP ship built in 1974 and worked hard, the hull is perfect) and they should be a target for those countries developing their own MCM capability like either Indonesia or the Philippines for instance.
If NZ ever wished to return to a specialised ship, working in cooperation with the RAN, they would be a perfect acquisition.