I've been diving for years and I learned that the deeper you go, there is a higher chance some of equipment can malfunction. Because of that I have to always pl

I've been diving for years and I learned that the deeper you go, there is a higher chance some of equipment can malfunction. Because of that I have to always plan or consider some backup solution. And that started to reflect on my daily activities - e.g. when I book a flight or a route, I put everything on paper, just in case all my devices die (which happened before).