Lyttelton Port is seeing a revolving door of senior figures with two board members calling it quits this week.
Chairperson Margaret Devlin and board member Don Elder are the latest to step down, with a lack of agreement within the board cited as the reason.
Chief Executive Kirstie Gardener also resigned a fortnight ago with no explanation, making interim Chief Executive Jim Quinn the fourth in four years.
Craig Harrison from the Maritime Union speaks to Corin Dann.