Board Thread:Roleplay/@comment-28920015-20170817024335/@comment-29194274-20170820033127

(When you fall into it if you are somehow not killed before the end of the fall you are spread across time and space and for the most part your physical form resides in the Undertale version of the Void.)

(Or that's my head cannon and I'm currently in control of the only character to cannonly fall in so I'd assume it'd be true as no cannon information beyond the fact the Gaster is trapped in a sort of 'Void' most of the time and he was spread across space and time.)