high gravity as a substitute for high speed relatistic time dilation effect from the article using time dilation under the theory of general relativity for instance residing inside of a hollow high mass object are you sure this is accurate i was under the impression that according to the shell theorem the net gravity inside a hollow symmetrical sphere was zero if the hollow object isn't symmetrical there could be some gravity inside but in that case it would be no different from and probably less efficient than standing on the outside of a high mass object