An extension at the end of Queens Wharf to tie up large cruise ships has nearly doubled in cost and is being appealed by several groups deeply upset with Mayor Phil Goff's support for the controversial project.

The Weekend Herald can reveal the cost of building the 90m fixed gangway and two concrete mooring structures fixed to the seabed - known as dolphins - has blown out by 75 per cent from $9.4 million to $16.9m.

On top of that, council's development agency Panuku has spent $1.7m on professional fees for the mooring dolphins and will have to lawyer up

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