Past Tunnel

The Past Tunnel is a phenomenon that allows one to communicate to and from the past, up to 30 years. It is in a large crater in Amerope, where Yuuichiro Hikari studied it. Colonel.EXE used it often to aid Rockman.EXE, and Barrel once used it in the movie Rockman.EXE: Hikari to Yami no Program. It was created when Duo’s Comet crashed onto the Earth 30 years ago, in an attempt to annihilate the planet from the past.

When Barrel was marked with his Crest of Duo, it shot through the Past Tunnel 20 years into the past to brand him.