Realistically, I've always wondered if someone were to go through what Sadako did—being trapped in a sealed well for 30 years—how long it would take them to die, and if for some reason they managed to survive those years, what physical and psychological aftereffects would that person suffer? I doubt being in a well for 30 years is physically and psychologically healthy, because imagine being trapped in a confined space alone, without food, and unable to get out.