That is a terrible analogy. In space there is no hospitable habitat you can get to easily if your equipment fails. In OW that is not the case - you can swim for the surface, which is doable in dives to recreational limits.
so what?? how are you able to go exploring in space OR underwater?? LIFE SUPPORT
try doing a CESA from 100' after 20 minutes bottom time and see how you feel in the morning. I know we train with doing it from a full breath of air from 20'-30', but just for fun and to prove a point, start at the bottom with your lungs empty such as would be the case if:
your octo got caught on something and is now missing the diaphragm and grill. (I have found those on the bottom at sites before; made for interesting speculations on the boat later) and for whatever reason your primary' fails completely too.
the chances of both happening on the same dive are slim, but people still play the lottery
In overhead, one carries redundancy, which should make it near impossible to be left without equipment that can get them back to OW and the surface, when used correctly.
oh wait and your redundant gear is is more equipment of what variety?? LIFE SUPPORT thank you
As I said earlier, equipment failure in and of itself, does not cause people to die. It is one's response to this equipment failure that kills one or not. If my reg stops working, there are MANY options for me to take, in order to save my life.
Even in space I imagine they have redundancy up to the eye balls. But if it all fails, it is not comparable to the ocean.
umm, alright, the point that I was supporting with the analogy was that you cannot go into either environment without equipment that provides you with the conditions that your human body requires in order ro remain alive.
If you can escape one, but not another hostile environment back into your native one under your own steam that's great. Really it is. But you also are definitely NOT STAYING in either inhospitable one without the LIFE SUPPORT equipment which was my original point.