Divers Down! by Hal Gordon was published by Whitman as part of their juvenile fiction range in 1971.
The book contains the following notice:
This story takes place at Makapuu Oceanic Center, fifteen miles from Honolulu, Hawaii. It is a real place - the home of Sea Life Park, the Oceanic Institute, Makai Undersea Range, and the Oceanic Foundation, as described in the story. All place names are real, as are the Makapuu ships Westward and Holokai. Mr. Taylor A. Pryor, known as "Tap" Pryor, is a real person. The characters, while typical in many ways of the young people employed during summers at the Center, are entirely fictional, as are persons other than Tap Pryor. If any of the characters in the story resemble real persons, the resemblance is coincidental. The story, too, is fictional, even though the background is real.
Founded in 1960, Makapuu Oceanic Center became the Oceanic Institute in 1972 and still exists today. In 2003 it became an affiliate of Hawaii Pacific university with a formal merger occurring in 2013.
The illustrations are credited to James Temple which I assume includes the cover artwork.
