Ever wonder what to do with that big green suitcase? How would you help your buddy if they needed oxygen? As a recreational diver, you can receive training to provide vital first aid that can make a difference to a scuba diver with decompression illness. The DAN Oxygen Provider Course provides entry-level training in the recognition and management of possible diving-related injuries using emergency oxygen first aid. This is the basic DAN O2 course that everyone talks about.