Launch beetle probe

Ryland Grace launches the four beetle probes—John, Paul, George, and Ringo—toward Earth, each carrying a Taumoeba mini-farm and a USB drive of scientific data, after deciding to turn the Hail Mary around to rescue Rocky instead of returning home himself. This act of launching the beetles is the decisive pivot of the mission: it severs Grace's own path home, commits the solution to Earth's survival to an autonomous robotic fleet, and frees him to attempt a rescue of his stranded alien friend. The beetles are the only remaining link between Grace and his homeworld, and their departure marks the moment he accepts his own probable death in order to save both species.

Decision and Preparation

Grace makes the choice after weeks of agonizing. He has been watching Rocky's engine flare disappear from the Petrovascope day after day, and he knows the Blip-A is derelict—its Taumoeba-82.5 has eaten through the xenonite fuel tanks. The Hail Mary still has enough fuel to reach Earth, but Grace calculates that if he turns around to find Rocky, he will not have enough food to survive the return trip. He sobs into his hands, seeing Rocky's carapace and his fidgeting arms whenever he closes his eyes. The decision is not easy, but he sticks with it. He prepares the four beetles—John, Paul, George, and Ringo—each already fitted with a sealed Eridian-steel mini-farm containing a colony of Taumoeba-82.5 and a Venus-like atmosphere. He also copies all his scientific findings onto USB drives and loads them aboard each beetle. The mini-farms are designed to keep the Taumoeba alive for years, with a coil of Astrophage tubing that the microbes can only reach at the outermost layer, forcing them to work their way down a 20-meter tube. Grace has already refueled John, Paul, and Ringo after using them as ad-hoc engines; George is still full from the original mission. He epoxies the mini-farms to the undercarriage of each beetle and spot-welds a small counterweight to the top to keep the center of mass within the guidance computer's tolerances.

Launch and Trajectory

Grace fires the beetles away from the Hail Mary while the ship is still under thrust toward the Blip-A. He watches them on the Petrovascope: four tiny dots of Petrova-frequency light, barely visible, growing fainter as they accelerate toward Earth. He knows the beetles will experience several additional months of subjective time due to the extra mass of the mini-farms, but the guidance computers—designed by Steve Hatch—will compensate by tapering acceleration as needed. The beetles will identify constellations, orient themselves, and broadcast their location once they enter radio range of Earth's Deep Space Network. Grace calculates that from Earth's perspective, the beetles will arrive in about thirteen years. He speaks aloud to the empty control room: "I know you'd love a beetle to take apart, but I couldn't spare one." The beetles' spin drives are much smaller than the Hail Mary's, so their light will soon become invisible to the Petrovascope, especially as they zoom off in the opposite direction from Grace's own course toward the Blip-A.

Consequence and Finality

With the beetles gone, Grace has severed his last physical connection to Earth. He brings the spin drives back online and continues on course toward Rocky's last known position. The beetles carry the only copies of the Taumoeba-82.5 strain that can survive Venus's atmosphere—the strain that will eventually save Earth. Grace knows that even if the beetles succeed, he will never see his homeworld again. He has enough food to reach Erid and a few months beyond, but not enough to return. He accepts this as the price of saving both species. The beetles' launch is not a triumphant send-off but a quiet, final act of commitment: Grace sends the solution ahead of himself, knowing he will not follow.