Police, whanau and locals began searching, in sometimes difficult conditions, without success. The Police National Dive Squad also searched the following day, finally standing down at 10pm.
Mr Brandt recognised that Mr Tap's next of kin 'had issues' regarding whether the search should have continued, but that was the subject of a separate investigation.
Local police, family and members of the public continued searching, however.
Mr Tapu's body was found on March 2, police concluding there was nothing suspicious or untoward about his death.
"The evidence is silent as to what actually happened," he added.
"He looked prepared with all the appropriate gear. He was snorkelling and not using tanks, and was experienced. It was an area that he was familiar with ...
"In the most basic of diving practices it is always safest to dive with a buddy," he concluded.