There have been other incidents just outside of the Michigan Stadium tunnel. In 1973, Ohio State players, after exiting the tunnel before kickoff, ripped down the ‘M Go Blue’ banner at midfield.

the tunnel is the nerve center of the largest stadium in the country. And from now on, after it is formally dedicated before fifth-ranked Michigan’s game against No. 10 Penn State on Saturday ...

On Thursday, the Michigan Board ... to touch the "Go Blue" banner before every game, but students walk out of the tunnel onto the field for graduation ceremonies at the stadium.

The Michigan Wolverines are making a significant change to Michigan Stadium that was partly ... and confrontations inside the tunnel that took place before, during, and after games this year.

(AP) — Michigan Stadium’s lone tunnel — the site of altercations ... did last season with Michigan State’s Mel Tucker well before the postgame altercation between Spartans and Wolverines ...