39: Chapter 39 Empty Echoes
The lunar south pole, at the edge of the Shackleton Crater, a jagged zone where eternal shadow meets thin sunlight.
This is a corner forgotten by time. Temperatures hover around minus 230 degrees Celsius year-round, and even the air has long since frozen and escaped, leaving only absolute vacuum and deathly silence.
The rugged surface is covered with fine lunar dust accumulated from billions of years of micrometeorite impacts, presenting a lifeless grayish-white under the occasional light reflected from Earth.
The massive crater walls cast long, sharply defined shadows, like portals to the netherworld.
At this moment, in this extremely silent wasteland, a creation that does not belong here is moving cautiously.
The guanghan-1 probe. Its main body is a flat cylinder about two meters in diameter and 1.5 meters in height, with a shell made of matte-treated Panshi-Carbon Crystal composite material, colored nearly identical to lunar soil to minimize the possibility of being detected by optical observation.
The top is a hemispherical multi-functional sensor head, integrating a high-resolution terrain camera, a multi-band spectrometer, a miniature synthetic aperture radar, and most crucially—a super-sensitive wide-band quantum noise receiving antenna.
The bottom features three landing legs with shock-absorbing mechanisms, and a miniature robotic arm used for precise sampling and weak physical signal excitation.
Encapsulated in its heart is a dedicated quantum computing unit based on the mystic light-1 architecture, currently running a simplified version of the contact protocol analysis algorithm from Nuwa at minimum power consumption.
The probe's landing process was perfect. It took advantage of a space bus mission by vermilion bird-1 as cover, entered lunar orbit as a secondary technology verification payload, then autonomously changed orbit and decelerated, finally relying on high-precision terrain matching and inertial navigation to achieve a soft landing on a relatively flat rock ridge just 75 meters from the predetermined coordinate point.
The entire process avoided the peak scanning periods of the Imperial Alliance's lunar orbit monitors, and the lunar dust kicked up upon landing quickly dissipated in the vacuum.
Now, it has been quietly lurking in this frozen hell for eighteen hours, completing the secondary calibration of all systems in the extreme lunar environment.
guanghan-1, this is Wangshu Command Center. Status confirmation. Lin Shen's voice came through the 380,000-kilometer quantum encrypted link; despite a delay of a fraction of a second, it was still clear.
Moon Palace received. All system self-checks passed. External environment: temperature minus 234 degrees Celsius, no significant radiation anomalies, lunar dust electrostatic levels normal. Preparing to initiate the first phase of the passive detection program. The probe's response was synthesized by AI, but its logic core was directly controlled by Nuwa.
Approved. Initiate full-spectrum passive listening, focusing on monitoring the previously discovered anomalous spacetime ripple frequency band. The robotic arm is to prepare for in-situ analysis of surface lunar soil composition; take care to avoid any operations that might trigger vibrations.
Command confirmed.
The hemispherical sensor head at the top of the probe began to rotate silently, like a stealthy nocturnal animal slowly pricking up its ears.
The high-sensitivity antenna unfolded, beginning to capture any trace of unusual sound in this dead, silent place—electromagnetic noise, cosmic ray background, potential thermal radiation anomalies, and most crucially, those faint ripples suspected to be spacetime metrics that are almost impossible to detect with conventional instruments.
Meanwhile, the miniature robotic arm at the bottom reached out gently, its multi-functional probe tip touching the surface of the lunar soil.
It did not dig, but instead released a beam of extremely low-energy focused ions to non-destructively excite the surface particles, and analyzed the reflected characteristic spectral lines through the built-in spectrometer to determine the elemental composition and mineral structure.
Time ticked by, and on the large screen in the command center, data streams scrolled smoothly.
The lunar soil composition analysis results were transmitted back: similar to the Apollo samples, it was rich in silicon, aluminum, calcium, iron, titanium oxides, and trace amounts of hydrogen (likely from solar wind). No significant abnormal elemental enrichment was found.
The passive listening channel was also, at first, a piece of near-perfect silence, with only uniform cosmic background noise and the background signals that the instruments themselves could not eliminate.
However, just four hours and seventeen minutes after the passive listening program started, a red prompt box labeled Abnormal Pattern Recognition suddenly popped up on Nuwa's monitoring interface.
Non-random background disturbance detected. Nuwa's voice rang out in the command center, calm but with a hint of gravity. Target frequency band: extremely low frequency (millihertz to microhertz). Signal strength: three orders of magnitude below the instrument's background noise, but possesses strictly periodic repetitive characteristics. Attempting to extract and enhance.
Lin Shen immediately sat up straight, staring fixedly at an almost flat waveform line that had begun to appear on the main screen. But as Nuwa applied complex mathematical filtering and signal accumulation algorithms, an extremely faint yet clearly sinusoidal curve gradually emerged from the ocean of noise like a ghost.
The signal period is stable, approximately equal to... 1.37 Earth hours. The amplitude has a regular pulsation of less than one-thousandth, and the pulsation period has a simple fractional relationship with the lunar rotation period. Nuwa analyzed quickly. Attempting to mathematically parse the signal waveform itself. Preliminary judgment: its waveform function is not a simple harmonic mode of natural oscillation, but is composed of multiple modulations superimposed...
Just then, the quantum computing unit responsible for analyzing the signal transmitted back an even more shocking intermediate result.
In the core carrier of the signal, an embedded high-order mathematical sequence has been discovered. The sequence itself does not have the characteristics of traditional information encoding (such as 0/1 bitstreams), but is a pure, highly complex mathematical pattern with a self-similar fractal structure. Nuwa paused for half a second, seemingly calling upon a larger mathematical database for comparison. Performing pattern matching... Matching complete. The topological structure and fractal dimension of this mathematical sequence exist with 94.6% structural similarity to the mathematical laws implied by the non-coding gene fragments of the pandora virus, as well as the information patterns of the anomalous isotope spectra of the material on the surface of the lunar void.
In the command center, everyone gasped. Although they were mentally prepared, such a high-similarity confirmation still hit them like a heavy hammer. Three completely different physical carriers—biological base pairs, elemental isotope abundance ratios, and spacetime ripple fluctuations—actually carried a highly consistent mathematical language! This almost definitively proved that they originated from the same technical system, or rather, the handiwork of the same intelligent civilization!
Virus... signal... ruins... an expert murmured. What exactly are they saying? Or, what are they doing?
Lin Shen's gaze was fixed on the resolved mathematical structure diagram on the screen. It was beautiful, complex, and filled with a certain non-human, cold logical aesthetic. He recalled Nuwa's previous speculation about a universal technical language.
It's not a beacon, nor is it a key. Lin Shen suddenly spoke, his voice somewhat hoarse. At least, not entirely.
Everyone looked at him.
If it is a universal technical language that spans different media, then its purpose might first be to record and identify. Lin Shen thought quickly. Just like how we etch circuits on chips, encode proteins in DNA, and write comments in software. This sequence might be identifying a certain system, protocol, or instruction set. The virus carrying it might be a signature or version number of some biotechnology of this civilization. The lunar material containing it might be a formula imprint or quality control code for the materials used to build the ruins. And this spacetime ripple signal...
He pointed to the slightly fluctuating curve: It might be playing or maintaining this identifier. Like an infinite loop written on spacetime itself... a system self-check signal? Or, is it the heartbeat of some sleeping system?
This speculation sent a chill down everyone's spine. A civilization system capable of engraving an identifier onto the structure of spacetime and maintaining a heartbeat for 200 million years?
If this is a heartbeat, Zhao Zetao's voice was dry, then where is the body that possesses this heartbeat...? Is it right there in the void beneath our feet? Is it... still alive?
As if in response to his question, Nuwa's alarm sounded again, this time even more urgently!
Warning! The passive listening system has detected an unplanned fluctuation in the signal source intensity! The fluctuation magnitude is 0.003%, but the trend is clear—it is slowly strengthening! At the same time, the probe's miniature synthetic aperture radar's penetration scan of the ice layer above the void shows that the local electromagnetic reflection characteristics of the void's internal geometric structure are undergoing synchronous, faint changes!
What?! Lin Shen stood up abruptly. Strengthening? Changing? Did our probe's arrival trigger something?
Causality cannot be determined. But the temporal correlation is extremely strong. Nuwa responded. Recommendation: Immediately switch the probe's operating mode to a minimum-power silent state, cut off all active signal transmissions, and retain only the minimum life support and passive recording functions to observe the signal's trend of change.
Agreed! Execute immediately! Lin Shen did not hesitate.
The command instantly reached the moon via the quantum link. guanghan-1 immediately stopped all robotic arm activities and shut down all non-essential equipment except for the passive listening antenna and core life support systems, freezing like a real rock.
The command center fell into a tense wait. On the screen, the curve representing the anomalous signal intensity, within a few minutes after switching to silent mode, its strengthening trend seemed to... stop, stabilizing at a new level slightly higher than before, continuing its stable heartbeat once every 1.37 hours.
Everyone breathed a sigh of relief, but the boulder in their hearts felt even heavier.
It reacts to external stimuli! Although the reaction is extremely weak and slow, this proves that the thing hidden beneath the ice is not completely dead! It may be in a state of extremely deep dormancy, but it still retains some level of perception and feedback capabilities!
Our exploration activities, even just passive listening, might be like throwing a pebble into a stagnant pool. Lin Shen slowly sat back down, his face grave. Although the ripples are small, they were indeed generated. If we throw in a larger pebble, such as the Imperial Alliance's drilling equipment, or large-scale construction...
The consequences would be unimaginable!
This discovery must be reported to the highest level immediately! The guanghan project must immediately re-evaluate its risk level! We need to formulate the strictest contact protocols, or even... consider whether we should temporarily suspend any active exploration until we better understand the nature and critical points of this system! The experts spoke up eagerly.
Lin Shen, however, shook his head, his gaze fixed on the lunar map on the screen, focusing on that shadowed area.
I'm afraid... it's too late. He said in a low voice. The Imperial Alliance's Zeus Station advance team is scheduled to arrive in three months. They won't know what is beneath their feet. And our discovery is currently based only on extremely weak signal correlations and mathematical speculation, lacking direct physical evidence. It is difficult to use this as a reason to persuade the international community, or even to persuade some of our own people, to take the huge political and economic risks of stopping a large-scale, publicly announced lunar development plan.
He paused, a flash of determination in his eyes. But we can speed up. Speed up our own understanding. guanghan-1 will maintain silent observation and continue to collect data. At the same time, Nuwa, I want you to use all available computing power to fully crack this mathematical sequence! Treat it as the Rosetta Stone of an unknown civilization! We need to figure out what this identifier actually means! Is it a warning? Is it an instruction? Or... part of a password to start some program?
Computing power resources are being reallocated. The mathematical sequence deep analysis task has been listed as the highest priority. Nuwa responded immediately.
Also, Lin Shen took a deep breath and issued an order that might change the future. Using my highest authority, unlock the initial design database of the kuafu interstellar probe project in advance. I need to assess whether... if the worst-case scenario occurs, the thing on the moon is accidentally activated, or the Reapers fifty light-years away arrive early, we have the capability to send at least a portion of the seeds of human civilization and all the data about these ruins to a safe zone as far away as possible.
The kuafu project! That grand plan originally scheduled to officially launch in ten years, aimed at sending humanity's first interstellar probe to Proxima Centauri! Lin Shen was going to use its resources now!
The command center fell silent; everyone was shocked by the weight of this order. This was no longer just simple scientific competition or strategic defense; this was preparing the final escape pod and knowledge backup for the unimaginable unknown risks that civilization might face.
Authorization confirmed. The kuafu project initial design database has been unlocked. The highest alert status for the relevant design teams has been activated. Nuwa's execution was without lag.
Lin Shen took one last look at the steadily beating signal curve on the screen, and the complex, beautiful, yet chillingly cold mathematical structure diagram next to it.
The echoes of the void had already arrived.
It was low, slow, and spanned hundreds of millions of years of time.
And humanity, this group of children who had just learned to look up at the starry sky, was holding its breath, trying to understand this whisper from the ancient past that might determine their own fate.
The echo has arrived, and the interpretation must begin.
Time, perhaps, is more urgent than anyone imagined.