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"Suddenly, the blackness expands and surrounds the Enterprise, but causes no harm. In the void, no stars are visible, but Picard decides to hold position and collect whatever information they can. Unfortunately, Data indicates that the sensors detect nothing and that the void has no mass or dimension, and logically shouldn't exist. Picard orders an exit course, but as the ship travels, there is no end in sight and the space appears to be caught in a loop. Data drops a stationary beacon to use as a positional reference. At warp, the signal rapidly fades behind the ship, but is soon picked up again dead ahead ― proof the ship is running in circles."
This would imply that there is no subspace here, because the Enterprise has been shown many times being able to detect subspace signatures, and Voyager can even detect apertures where 5-D beings arrive through subspace, as shown in "Bride of Chaotica," on VOY.
The creature is also directly stated on the Star Trek official database to exist outside of the universe, to be undefinable, and that the non-dimensional void is extra-dimensional.
This answer on the Scifi Stack Exchange website describes it best:
"The very clear implication is that Nagilum is immortal, in the fullest sense of the word. He is eternally living. Our best evidence is that, for want of a better explanation he seems to lack any experience of, or even the concept of death.
(Is it also true that you have only a limited existence?...You exist -- and then you cease to exist? Your minds call it "death.) Nagilum himself (itself?) seems to exist in a pocket universe of his own devising. Data describes it as a...lack of dimension rather than an alternate dimension (like fluidic space) or a subspace realm like we see in Schisms.
Given his obvious level of control over this region of non-space, and the fact that such a place (or non-place, to be precise) would survive the end of our universe, there's no special reason to assume that he would be subject to the same mortality as other more mundane energy life-forms."
This would imply that there is no subspace here, because the Enterprise has been shown many times being able to detect subspace signatures, and Voyager can even detect apertures where 5-D beings arrive through subspace, as shown in "Bride of Chaotica," on VOY.
The creature is also directly stated on the Star Trek official database to exist outside of the universe, to be undefinable, and that the non-dimensional void is extra-dimensional.
This answer on the Scifi Stack Exchange website describes it best:
"The very clear implication is that Nagilum is immortal, in the fullest sense of the word. He is eternally living. Our best evidence is that, for want of a better explanation he seems to lack any experience of, or even the concept of death.
(Is it also true that you have only a limited existence?...You exist -- and then you cease to exist? Your minds call it "death.) Nagilum himself (itself?) seems to exist in a pocket universe of his own devising. Data describes it as a...lack of dimension rather than an alternate dimension (like fluidic space) or a subspace realm like we see in Schisms.
Given his obvious level of control over this region of non-space, and the fact that such a place (or non-place, to be precise) would survive the end of our universe, there's no special reason to assume that he would be subject to the same mortality as other more mundane energy life-forms."
