ERD Full face mask certification: The ERD Full Face Mask Course provides the skills and knowledge for the ERD diver to utilize full face masks for emergency response diving. ERD Dry suit certification: The ERD Dry Suit Ops Course develops the knowledge and skills that are necessary for dry suit diving operations in emergency response diving. Introducing fundamental skills of dry suit diving and other important topics such as; encapsulation, contaminated environments, protecting portable water supplies and decontamination procedures.