You would have to complete quite a few classes before any NREMT ALS certs are given. Take a basic CPR/AED as dive injuries and how to treat them are much different than land injuries. Although always good to know BLS stuff, they won't be of much help in a dive setting. Focus on your narcosis symptoms, locations of nearest compression chambers, and pressure related injuries. I don't know why, but treating any traumatic injuries while still at depth is not discussed outside a dive medic course.