There are several organizations with worldwide recognition that provide training standards for individual schools. PADI, NAUI and SSI are three of the more popular in the United States. Certification from one or more organization will generally be valid between organizations, throughout the United States and around the world.
Among the scuba instruction schools north east of Nashville is Scuba Adventures. Using the PADI instruction method, Scuba Adventures offers multiple levels of certification.
101 Old Shackle Island Road
Hendersonville, TN 37075
In the southeastern Tennessee city of Cleveland is Quick's Diving Services. Because Quick's is affiliated with NAUI, your certification will be recognized worldwide.
Quick's Diving Services
1042 Cedar Springs Road SE
Cleveland, TN 37323
Located in Nashville, Blue Water Scuba is affiliated with Scuba Schools International. They offer certification over the course of four days.
Blue Water Scuba
103 White Bridge Road, Suite 4
Nashville, TN 37209
If you don't live near a school, but still want to get certified you have options. Using PADI's e-learning option, you can do your bookwork on-line from home. Then once you have completed the classroom learning, be referred to location world wide to complete your in the water work.