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About Me. Experience. Ratanang Maremane holds a Class II Commercial Diving License (IMCA) – Seadog Commercial. Diving School (2018), Class III Commercial Diving Supervisor License (DOL) – Seadog. Commercial Diving School (2016), Class III Commercial Diving License (DOL) – Seadog. Commercial Diving School (2011), Class IV Commercial Diving License (DOL) – University of. Cape Town Research Diving Unit (2009), Fleet Support Diver (39m Air) – SA Navy Diving School. (2007). Ratanang was the second black female diver to qualify as a South African Navy Diver and the. First Black Female Commercial Diver in South Africa. Her experience spans from being a Scientific Diver and Project Coordinator for the South African. Heritage Resources Agency (SAHRA) – Maritime Archaeology Department (2008 – 2011). At. SAHRA she gained vast experience on Underwater Cultural Heritage Research in and around the. South African coastline. She has been exposed to national and international special