In this moment, you are abiding in all of those dimensions. Your thoughts and emotions radiate from the fifth, while your vital energy is in the fourth, and your physical body is in the third. Psychological defects (klippa, "empty shells") have a lot of mass, so they "sink" to the lowest levels of those regions (the "hells"). That is why each of us are restricted to the densest regions of those worlds. To reach the lighter regions (the superior levels), we must extract our consciousness from the defects.
Only unconditioned consciousness can enter the superior regions. In other scenarios, imperfect but awakened people (such as "black magicians") are able to traverse the higher aspect of the fifth dimension, since it is the root of human consciousness. However, to protect humanity here on this planet, they have been restricted from that region.
On this planet, because humanity is so psychologically dense, we are indeed bringing "hell" to the physical world. Nature will stop this.