I thought that was a great question by
@johndiver999 and I figured that might be your answer…
know this: an ascent to the surface from 60 feet is almost exactly the same as an ascent to the surface from 30 feet. Yes, it will take you twice as long. However, as you are ascending, the gas in your lungs literally expands: that’s why we are taught to hum or let small amounts of bubbles out as we make such an ascent. And that literally makes up the difference.
I don’t necessarily expect you to emotionally believe that, and certainly not immediately. But you can at least use the analytical part of your brain to explain that to yourself. Keep reminding yourself of that: as you ascend, the volume of gas in your lungs will increase and you truly will make it to the surface with a lung full of air. And that is without rushing to the surface.
Remember that we want to ascend to the surface no faster than 60 feet a minute — ‘follow your large bubbles .’ This means that it will take you no more than a minute to get to the surface in such an emergency situation. Can you hold your breath for a minute? I know that you can!
Even when you’re at the point where you feel the need to inhale, I am quite certain you can hold your breath for one minute. I’m not saying it will be comfortable: it won’t be, because of our breathing reflex. But it will not be difficult or even painful, just uncomfortable.
You may find that explaining that to yourself and practicing that with yourself may give you the comfort to know that even if the absolute worst happens you can make it to the surface reasonably and safely without difficulty. Just having that proven, practiced knowledge alone will help you to both be more comfortable at 60 feet, as well as greatly reduce the odds that you panic if something happens.
And then after you remind yourself and prove to yourself all of that, remind yourself of all of the other things that have to go wrong. You have a tank full of air. You have not one but two regulators supplying gas to you. And you are going to have a buddy that is going to be just a few feet away who has all the same resources that you do. And it’s only if all of that goes terribly wrong that you will actually have to make your way to the surface. And even then, you have plenty of time to make a controlled and reasonable ascent to the surface just with the air you have in your lungs. Even from 60 feet — or even deeper, really!
Again, I’m not expecting all of this information to be a magic wand that will put everything at ease in a single moment. It takes a long time to change our emotional reaction to something. But at least having a lot of provable, factual information in your mind and reviewing it frequently between now and your dive can start to make that change in your perspective.
anyway, in the end, stay within your limits and work on expanding them in a careful and controlled manner. You’ve got this! The hard part is getting the gear on and getting in the water. If you can do that, you can work toward doing anything with just a little bit of additional time and effort.