The Theme of the Death of the Crew and Survivor's Guilt
Project Hail MaryBoth Grace and Rocky grapple with the guilt of surviving while their crewmates died.
increasing
Bearing strength in each event
decreasing
Grace's Guilt

The Question of Why
The Random Luck
Grace wonders why he survived and the others did not. He has no answer. He feels guilty for being alive.
The Memory of Them
He remembers Yao and Ilyukhina as friends. He honors them by continuing the mission. The guilt drives him to succeed.
The Resolution
Grace comes to terms with his survival. He accepts that it was random and that he can use his life to make a difference. The survivor's guilt is a motivator.
Rocky's Guilt

The Unknowable Danger
The Invisible Killer
Rocky learns that his crew died from radiation, something he could have prevented if he had known. The guilt is heavy.
The Self-Blame
He blames himself for not knowing. He wonders if he could have saved them by moving them to the workshop. The guilt is a burden.
The Shared Experience
Grace shares his own guilt, and they comfort each other. They are both survivors. The bond between them is deepened by this shared experience.
After waking from the coma
After learning about radiation