What would be the most pleasant form of euthanasia?

https://leminal.space/post/12846451

What would be the most pleasant form of euthanasia? - Leminal Space

I was thinking sex + nitrous bag but I can’t think of a way for them to work together smoothly.

OceanGate expedition
we don’t know how much time passed between when they realized they wouldn’t be coming home and when they imploded…
Between the first crack and them dying was a fraction of a second
I meant when they knew they were going to die before it even imploded