I am unaware of any “true” interdimensional device available on this world line now. I would image the effects of such a device would be hard to hide.
TT_0 I recommend that you read the following archived posts. Although there are some interesting information about “Existing” portals that traverse the Space-Time continuumn, Time~Travel capability is just one ability that these devices are capable of, and the most interesting factor resides with the fact that they may even pre-date mankinds own history? (perhaps.)
“Utilizing The Earth’s Energy Grid To Navigate Time Vortex’s.”
“Time Port Area in Marfa Texas.”
“History of Uknown Origins & New Beginnings.”
“Stargate in the Andes.”
Questions, Comments, Concerns?
I would like your comments of this TT_O