What is now most likely the best known dive location in New Zealand?

I am finding the answer in the Westpac magazine called “love RED”, Issue 6-12 / 2011, page 12.

On the same page of the magazine I am reading also about the book TOP NEW ZEALAND DIVING SITES?  written by Darryll and Gillian Torckler.

“love REd” has five copies of the book  TOP NEW ZEALAND DIVING SITES?  to give away.

I am interested in the book and have answered the question:

WHERE IN NORTHLAND IS ONE OF DARRYL’S FAVOURITE DIVING SITES? and sent the answer: POOR KNIGHTS ISLAND NEAR WHANGAREI to the email given.

Darryl’s favourite diving location in Northland – Poor Knights island – is also the answer to the question:

What is now most likely the best known dive location in New Zealand?