Many years ago I went through a similar phase. This was the 90's when trimix was not readily available, at least not in the UK. I was diving on air regularly to 60m in the sea and 65-70m in caves (for some reason I felt deep cave diving on air was easier).
I decided to try to push my limits and see how deep I could go. At that time I believed I was "good" on air and that I could function as well at 60m as at 20m. Every weekend I was venturing just a little deeper in a quarry (deepest point in it is 104m) which had a vertical drop off that was perfect for diving.
One weekend I did my deepest yet. Everything felt good so I went to 74m. At least that is what I thought my computer said. After a few minutes the sound of my bubbles began echoing, or that's how it sounded to me. Then I got a ringing in my ears and a metallic taste in my mouth. I knew something was wrong and made the decision to get out but then my vision started to go, everything was getting dark. I knew I was passing out. It took all my effort to pull myself up (the quarry walls are covered in old steel cables) I got to about 35m when my head cleared and I managed to get my breathing under control. It was at this point that I read my computer and what depth I had actually been at -- 89.9m. I did my deco, got out and that is the last deep air dive I've ever done.
I now use trimix on pretty much all dives (I dive a rebreather these days so it costs nothing) regardless of depth.
No offence but the question regarding software kind of indicates that you don't have the knowledge to do this kind of diving. Pretty much every diver I know involved in 30m+ deco diving, whether tech or adv recreational divers, know what deco software is out there. There are loads of Buhlmann based programs available and an internet search will show them up.
Sorry to be critical but I am a firm believer that deep air is one of the worst forms of chest beating stupidity in diving. The widespread use of trimix has been one of the best moves in the diving industry.
As said above, get some mix training if you want to dive deep.
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