TrimixToo
Contributor
BTW, I once had a student who definitely benefited from it. He was a scientist who wanted to do some research in very cold lakes in a national park. He asked about it, and he was told he could not so it unless he had the master Scuba Diver rating. He also needed more training, since he had previously only been a typical warm water resort diver before that.
We mapped out a plan for a worthwhile MSD experience. He certainly needed dry suit. The dives would be at high altitude, so we added altitude. He would be dong some challenging navigation, so that was a must. Deep Diver seemed like a good choice. We did two distinctive specialties I teach. One was Advanced Dive Planning, a distinctive specialty that covers more than the DM program in terms of planning and executing dives without supervision. The second was a course very similar to GUE Fundamentals, focusing on buoyancy, trim, and propulsion techniques. He got the specialties and the MSD certification, and the parks service allowed him to do his research.
The experience did more than that for him, though. He is now a certified cave diver, and we did a cave diving trip together in Mexico a couple years ago. He just enrolled in my technical diving instructional program and will be learning about decompression so he can do deeper caves. As a result of his MSD experience, he is a completely different diver than he was before.
I think that's the first actual useful, practical aspect of getting that card I have ever heard of.