"Even on that dive I found something, an old chalice, but I threw it back as I didn't think my mother would want to keep it as it wasn't in the best of condition."
But it started a love affair with the underwater world for the now 72-year-old and the next really interesting things he found were treasure from the steamer Elingamite, that he and fellow dive buddy Kelly Tarlton got from the wreck at the Three Kings.
Mr Doak was shocked when contacted by the Advocate to talk about his well-deserved honour - his wife Jan had managed to keep it a secret from him until the newspaper broke the news - but rather than being disappointed, he was delighted.
"Oh that's wonderful. It's been such a great day for me. I've just been speaking to the United States where my 19th book - Gaia Calls, a collection of memoirs - is being released and I've got confirmation that a six-part television series is being produced on New Zealand's underwater world. Now this award, amazing."
Mr Doak said he and wife Jan's love of diving stemmed from when they met, she wanted him to teach her to dive so he married her. And just a few days ago they were diving at the Poor Knights again and he is still in awe of the marine life there.
"We were there as part of a TV programme and it was bursting with life down there since it had been protected. The snapper are colossal and it gives us such a thrill to see the way it has progressed as a direct consequence of becoming a marine reserve," he said.
"The Poor Knights is one of the best diving spots in New Zealand and in the world. It would be wonderful if we could convince people about the benefits of having more marine reserves along our coast."