She pushed herself over to the companionway, got her head aimed "down" through the hole in the floor, and pulled herself straight to the bottom level of the command module. The hatch in the floor—the one that led to the ice tunnel that terminated in the boiler room—had already been closed, as a basic safety measure. But Dinah verified that one last time and made sure it was sealed. Because in a few seconds, there would be nothing but vacuum on the other side of it.