State-owned ferry operator TT-Line has hit another stumbling block in the delivery of replacement Spirit of Tasmania ships.

A safety assessment has found a berth at Geelong, where the newly constructed Spirit of Tasmania IV was going to be stored temporarily, is not strong enough.

Spirit IV, which has been getting its final fit-out over the past two months, has been moored at Hobart's Macquarie Wharf.

The wharf is used by the many cruise ships that visit over summer, meaning it cannot stay there.

While it was originally set to be temporarily stationed at Point Henry at the Port of Geelong, TT-Line has confirmed "a mooring safety assessment indicated that the berth required infrastructure works".

Instead, it will need to be moved between different berths at the Port of Geelong.

"As th

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