The boat the brother of a Tauranga man was last seen on before going missing at sea is now being forensically examined.
Peter Blair's brother William 'Kerry' Blair went missing after launching his 9m aluminium boat Erie from the Malborough Sounds on March 8.
Mr Blair has joined family, police and others in searching for him since.
The Erie was found drifting 200kms off the Taranaki coast and towed back to Port Taranaki, where it was now undergoing forensic and mechanical examinations in search of some clue as to what has happened.
Kerry Blair remains missing.