I always wanted someone to ask me this exact question!
So, I FELT like I was very close to death, but I don't THINK I actually was that close to it, as I would need to climb about 200 steps to reach the 50m destination and fear got a big hold of me around the 20 step, I was barely 3m above ground when en my whole body locked up in the tower, I couldn't move a single muscle, I was terrified, not of dying, but at the feeling my own body, who I thought I owned, acted against my will, it held me there, unable to move, barely able to move my head around, it was the worst 2 minutes of my life. When it passed, I tried getting over it but my body stopped me again, it wasn't fun. If you ever had sleep paralysis it's a similar feeling to that, but worst because you are NOT relaxed, it's the opposite, the body is TENSE as fuck, like if I had a 2h full body workout in 2 minutes, my hand bleed a bit because my nails penetrated my skin. Method was a huge open, easily accessible communication tower.
So that's the closest I was to death in my attempt, once I was very close to jumping off a 100m cliff, I was standing on the edge of it, I was so calm and relaxed, that was on theory closer to it, but yeah. I didn't suffer or tried enough. I'm mostly at peace with it now. Knowing that my body has stopped most of my attempts.