High Altitude Low Opening.

You jump at 14K to 25K with O2 bottles (and cold weather gear) and altimeter deploy or manual deploy your chute at 3K to 5K.
With glide techniques, you can get 1:3 distance over ground lateral travel. For every 3 feet you fall, you can travel 1 foot in a given direction. I needed 1 HALO to get my Merit Badge.
There are acual people, perfectly sober, that pay money to exit perfectly functioning aircraft. I loved it when I was young, but only think of it fondly now.