Two new Spirit of Tasmania ferries, yet to start sailings because of a failure to build a berth, require further hull upgrades to prepare for extreme weather.

One of the replacement vessels has been in Hobart since August 23 for its final fit out, while the other is in Finland, where it was constructed.

They are expected to be in service in late 2026, years behind schedule, when a delayed berth in the northern Tasmanian city of Devonport is completed.

Failure to build the berth in time for the ships' completion has made international news and resulted in one being kept in Scotland during an unsuccessful lease attempt.

A "recovery team" tasked with getting the ships' delivery back on track recently said it was upgrading hull specifications to further prepare for rare or extreme weather

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