I have been struggling with depression for 10 years. Diagnosed and all. I was a wreck. A total wreck.
Now, I still don't know if I'm out of it. I don't' know that I ever will be. It's terrifying. I see patterns I wish were long gone creeping back all the time.
But I finally have lasting and enduring hope. And I've come to realize that all these times I wanted it all to end... I just wanted to stop suffering. At the time, death seemed to be the only way.
No doubt they will experience some sort of hardwired survival instict which kicks in as they are about to go, but that's about it.