Boeing and ULA are now testing the new Emergency Egress System for their first crew launches. It’s basically a zipline with a few twists specific to the needs of astronauts leaving a rocket in a hurry. It’s the fastest, simplest, safest way to get clear of danger should anything ever go wrong with a rocket close to launch. Spaceship crew will strap themselves into the seats, and use a brake to control their descent from the rocket. But basically, they’re still ziplining – just like we did across Colorado’s Royal Gorge.