Divers Institute of Technology | DIT | Commercial Diving School & Diving Courses | Scuba Diving, Underwater welding and commercial diving school, veteran owned and operated in Seattle. At Divers Institute of Technology (DIT), you can get prepared for a diving career in just 7 months! Check out Divers Institute of Technology and become a commercial / scuba diver, underwater welder, and start your diving career with us!.