Terrible way to go
The reason he died is because he was stuck upside down at a weird angle. The human body isn't designed to be stuck upside down for hours and hours, having to work against gravity for that long will cause your heart to fail. Doesn't help that he basically couldn't move at and was getting no circulation, so his arms and legs were gradually dying. Blood pooling to his head, lungs filling with fluid...
You couldn't pay me any amount of money to crawl around a cave, I'm not even allowing the slightest possibility of going out like that.