I think you can safely assume that whatever is appropriate to be done in respect of the culpability of anybody, will be dealt with."
Joyce said he did not know if that would go further than the captain.
The crew had been interviewed and while the chain of command began with the captain there were "one or two" people of interest.
"The crew's job on a ship like this is to follow the instructions of the ship's leadership," Joyce said.
"It is inexplicable that on a perfectly calm day, with all the modern technology that are available in terms of navigation, that a very well-documented reef would be hit in this way," Smith said.
Police declined to comment on the arrest, saying responsibility lay with MNZ.