Oh, here is what I found on the Shedd Aquarium, Chicago, Illinois website about their volunteer dive programs:
"Caribbean Reef Diver
Our most popular program gives highly qualified divers the opportunity to hand-feed the animals in our Caribbean Reef exhibit while giving public presentations. Because of the popularity of this program, there is often a waiting list. A prospective diver must meet minimum scuba requirements (30 hours logged open-water diving) and successfully complete a scripted audition before beginning to train for this position. All volunteer divers must be at least 21 years old.
Marine Mammal Diver
Qualified divers who have logged at least 30 hours of open-water dive time, including at least five hours of cold-water diving, assist our Marine Mammals staff with early-morning cleaning dives in the Oceanarium. These divers work to ensure that our facility provides the best possible environment for our marine mammals. Positions are available seven days a week between 7:30 and 9:30 a.m. The minimum commitment is six months for weekday volunteers and one year for weekend volunteers. Back-up divers are also accepted into this program. All volunteer divers must be at least 21 years old.
Wild Reef Diver
Volunteers who are qualified to dive in Wild Reef are given the opportunity to perform cleaning and other maintenance in several of the exhibits habitats. Wild Reef is one of Shedds newest and most popular exhibits. The animals and their surroundings are patterned after the beautiful coral reefs found in the Philippines. Wild Reef divers must have at least 30 hours of logged open-water diving and rescue certification."
I also examined their volunteer application and did not find any specific requests for dive certification. There is a general request for special training, etc. And here is a link to view the application:
http://www.sheddaquarium.org/pdf/shedd-volunteer_application.pdf
My whole point about this is it is not new, it has been done before, and with a little ingenuity and common-sense, the original poster ought to be capable of solving his problem.
I do not like ad hominem debates and usually refrain from participating in them.