The Italian investigation into the deadly sinking of the 'unsinkable' Bayesian superyacht could drag on a while.  

New Zealand-born captain James Cutfield is being investigated for possible manslaughter and negligent shipwreck charges.  

He's being advised by two Italian lawyers, and has so far exercised his right to silence.  

Italy correspondent Jo McKenna told Mike Hosking the investigation could take some time, particularly as the yacht needs to be brought to the surface.  

She says before they do that they'll have to secure fuel supplies to ensure there's no leakage, which could take several weeks.  

McKenna says it took 11 months for the captain of the Costa Concordia to be charged.  

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