Passing through the barycenter of a binary supermassive black hole system with equal masses would involve extreme gravitational forces and significant time dilation effects. However, it's important to note that venturing close to or inside a black hole's event horizon is a highly theoretical scenario, and our current understanding of physics may not fully describe the behavior of matter and energy under such extreme conditions.
In the vicinity of a binary supermassive black hole system, the gravitational forces experienced by an object or a person would be immense. These forces can cause tidal effects, stretching and compressing the body in different directions, potentially leading to extreme spaghettification—a process where an object is stretched into long, thin shapes. The specific effects would depend on the precise trajectory and distance from the black holes.
Additionally, time dilation would be significant in such a scenario. As an object approaches the vicinity of the black holes, time would appear to slow down relative to observers far away from the black holes. This means that time experienced by the person traveling through the system would be substantially different from the time experienced by external observers. The closer the person gets to the black holes, the more pronounced the time dilation effect would be.
Survivability in such a scenario is highly doubtful. The extreme gravitational forces and tidal effects would likely cause catastrophic damage to any physical object, including the human body, long before reaching the barycenter of the binary system. Furthermore, the intense radiation and other extreme conditions near supermassive black holes would pose significant challenges to the survival of any form of life.
It's worth noting that our understanding of the behavior of matter and energy in the vicinity of black holes is still an active area of research, and new insights and discoveries may emerge in the future. However, based on our current understanding, venturing close to a binary supermassive black hole system would be an incredibly hazardous and inhospitable environment.