"The investigation report concluded that alcohol was the major contributing factor to Mr Adams' death," she said. "I accept that conclusion."
According to statements, Mr Adams played a golf with friend Tarn Ransfield and drank some beer during the round, which finished about 10.30am.
Mr Adams had a "couple of beers" as they drove to Pourerere after gathering their diving gear, planning a dive for seafood about the early-afternoon low tide.
They entered the water about 1km south of Pourerere, and the pair would signal to each other with a thumbs-up that they were OK. They were swimming back in when Mr Ransfield stopped at a rock to rest he could no longer see his fishing mate.
He soon established Mr Adams had also not reached the shore, and returned to the sea to start searching, as others on the beach called emergency services.
The Police national dive squad arrived the next day but it was not until late afternoon that the body was found.
Mr Ransfield told police Mr Adam had drunk only a couple of bottles of beer at golf, and two more as they drove to Pourerere, and did not appear intoxicated.