Silverback in Black - Call of Duty: Black Ops III

Hack the Data Vault and brace yourself for Cyber Avengening in Dead Ops Arcade 2 - 10

This can be done any time, after the second mission. Starting in the Safe House, do to the Data Vault which is next to the door where you enter from.

From the Data Vault you can look at your Clan Tag, Mission Reports, Loadouts, etc...

What you need to do is click on the Data Vault Secret Button which is in the top left corner. From there you will start a game of Dead Ops Arcade 2, which starts at the funeral of the Cosmic Silverback from the original Dead Ops Arcade from the original Black Ops game.

This is a reference to the AC/DC Song "Back in Black" which was in the trailer for Call of Duty: Black Ops I.

Cosmic Silverback