2 parts - Part 1 starts around 1:58:00.
I suggest scanning the first part to get a grasp of the scale of this event before watching. The event will require your attention to fully grasp why I claim this is the scariest thing I have ever seen.
Part one is a head scratcher. Part 2 is pure evil. Skim intermission train ride to find heads of state and government officials who were in attendance. Germany's Angela Merkle is a notable face.
Part 2 starts at 5:57:00.
Each part is roughly 35-45 minutes.
Full 6 Hour RT mirror of the Gotthard Tunnel opening Ceremony.
Off site links and mirrors.