The abyss plane is dim and dark.
It is said that in the distant prehistoric golden age, shortly after humans colonized the planet Helel, they began to organize exploration teams in the three planes and established a large number of scientific research bases there. Therefore, a lot of scientific and technological information was lost in the three planes, but fortunately escaped the invasion of the magic tide of the main plane.
Most of the scientific data that humans have about the abyss today were retrieved from the abyss by the ancient Solomon Empire during archaeological explorations during the Tertiary and Quaternary periods.
The universe where the main plane is located has less matter and more space. For example, the radius of the planet Helel is only more than 6,000 kilometers, while the distance from the planet to the sun is 150 million kilometers. This 150 million kilometers range is almost entirely empty space without matter.
However, the abyss is the opposite, with more matter and less space. The matter that makes up the main body of the abyss is called "dark matter", which is highly stable and does not participate in electromagnetic interaction. Due to its very weak interaction with photons, dark matter itself neither emits light nor reflects light.
Therefore, the abyss composed of dark matter is in pitch darkness all the time. Even if you turn on the flashlight and shine it on the dark matter wall, you can only see a dim beam of light that suddenly stops on the wall, as if it was cut in half - the light beam you see comes from the scattering of light by the air, but dark matter itself does not reflect light, so it appears pitch black to the naked eye.
Such optical properties make it difficult for the naked eye to function in the abyss. Fortunately, sound waves can still be reflected, so the Banshee King used the power of curse to temporarily give everyone the ability to "locate by sound":
When a sound is made, the sound waves propagate to the surrounding obstacles and then bounce back. Through the power of the curse, the corresponding "scenery" will appear in everyone's mind, as if they had seen it with their own eyes.
"Aske, what should we do next?" Mier asked worriedly as she looked at the outline of the cave around her.
"The Great Cave is located at the bottom of the abyss. The deeper you go, the more severe the erosion from the abyss becomes." The Banshee King said faintly, "You should go up as soon as possible."
The so-called up is the opposite direction of gravity. Gravity still exists in the abyss.
Everyone looked around. There were narrow cave walls on both sides. It was either forward or backward. Which road led to the upper level of the cave
"Mi'er," Ask said again, "Observe what the results will be if we move forward or backward in the future."
Mia was stunned when she heard this. So this is actually possible
The Banshee King smiled and said nothing beside her.
Mier nodded and began to observe.
Among the countless divergent world lines, 50% of the world lines lead forward, and 50% of the world lines lead backward. In other words, without any clues at all, everyone can only make a purely random choice.
Continuing to observe in the direction of a longer time dimension, she saw that in the forward world line, the terrain height was getting lower and lower; on the contrary, in the backward world line, after everyone had moved forward for about 4 hours, they suddenly saw a man-made building.
After Mier described it to him, Ask immediately made a decision: "Go back!"