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.)
http://www.xone.net/tti/board/ubbhtml/Forum1/HTML/000308.html

“Utilizing The Earth’s Energy Grid To Navigate Time Vortex’s.”
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http://www.xone.net/tti/board/ubbhtml/Forum1/HTML/000345.html

“Time Port Area in Marfa Texas.”
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http://www.xone.net/tti/board/ubbhtml/Forum1/HTML/000339.html

“History of Uknown Origins & New Beginnings.”
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http://www.xone.net/tti/board/ubbhtml/Forum1/HTML/000045.html

“Stargate in the Andes.”
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Questions, Comments, Concerns?

I would like your comments of this TT_O