The retired biologist says he never thought he would live long enough to see the once endangered species make such a strong recovery.
It's not easy rearing all those urchins at the Oahu-based hatchery but the scientists keep getting better at it.
The project demonstrated how it may be possible to restore larger areas much more quickly than would happen naturally.
A team of scientists remains committed to preventing species from going extinct in Hawaii.
The geologist, educator and voyager is tackling climate challenges with community-based solutions.