It was crazy. It was a crazy plan. The crushingly high acceleration that they had survived at the end of the big burn a few minutes ago was a physical reminder that they had only taken enough propellant to sync New Caird with Ymir . If they failed in their basic mission—if they couldn’t dock with Ymir and get her engine working—they had no way of getting back to Izzy, save perhaps by the utterly insane measure of diving into Earth’s atmosphere on their next pass and using the air to slow them down.