The second challenge in traversing other dimensional spaces is creating a shielding space that allows the laws of dimensions and time to be mapped into objects entering a new dimension. In simple terms, this involves constructing a space that belongs to the target universe's dimensional framework, yet by infusing it with conditions and materials from the solar system's cosmic environment, enables entities descending across dimensions to adapt to the rules of the new universe before fully entering it. For example, consider the airlock of a spacecraft: when a spacecraft enters or exits space, there is a relatively independent chamber. When humans enter this area, the air and gravity within are first eliminated so that the internal conditions match those outside the spacecraft—only then can astronauts in their suits safely move in and out. This mechanism operates similarly to the airlock used in submarines. The submarine's airlock also creates a third-party compartment where individuals enter before diving into deep sea; by flooding and draining water, the internal environment of the sub is gradually synchronized with the external oceanic conditions, allowing safe passage.
This condition is the most difficult. The main challenges are twofold: first, one must accurately detect the coordinates and environmental parameters of the target universe. Without such information, attempting to exit directly from an isolation chamber into space would be like stepping out wearing only a spacesuit, without any protection or stabilization. Although the amount of air inside the chamber is limited, once the chamber is opened, the vacuum of space will instantly suck out all the air. An astronaut without proper securing measures would be violently ejected into space—death isn't guaranteed, but the risk is extremely high. Therefore, only after thoroughly gathering data on the target universe's characteristics and rules can protective measures be properly designed to prevent fatal accidents during dimensional transition. Unfortunately, detecting the rules of a distant universe requires not only extensive experimentation and testing but also enormous resources—not just material ones, but also biological lives. The lifeforms sent out for exploration almost always perish entirely, leaving behind only the possibility that "it could work." In other words, while interdimensional traversal may be technically feasible, every dispatched organism vanishes without a trace, leaving only the assessment that "success is possible." Moreover, despite immense investments of matter and time, test results show that successful transitions are only possible in a few specific universes—those with similar elemental compositions or structures. According to feedback data, these favorable universes offer merely a one-in-a-billion chance of success compared to others—meaning the odds are nearly ten to one against survival.
Another critical point regarding the shielding space for dimensional crossing is that organisms entering a new universe must undergo prior modifications—either through injections or genetic adjustments—to adapt their physiology to the new dimensional environment. For instance, in a movie scenario, if a human were to dive into the deep sea, the best approach would be to allow them to breathe liquid oxygen under pressure equivalent to the surrounding depths via a specialized suit. If there were a pressure difference between the suit and the body in the Mariana Trench, the suit wouldn't provide adequate protection—the immense water pressure would crush it. Similarly, when crossing dimensions, since we don't know the rules of the destination universe, the organisms attempting the journey must be sufficiently robust and adaptable to rapidly adjust to the new environment upon arrival.
The third issue in traversing other dimensional spaces is that travel is only possible from higher-dimensional universes into lower-dimensional ones. Higher-dimensional universes contain far more comprehensive laws and elemental substances than lower-dimensional ones. Due to the limitations of lower-dimensional universes, beings from higher dimensions possess superior technology, power, and physical attributes compared to those in lower dimensions. This means that when a higher-dimensional entity jumps into a lower-dimensional universe, there is a certain possibility it could partially meet the rules and conditions of the lower dimension and thus survive—albeit on a limited scale. It's like throwing an ordinary financial analyst working on Wall Street into the remote mountains of Daxing'anling or deep within the Amazon rainforest: he might die, but not immediately; at least it would be better than being dropped into the depths of the Pacific Ocean.