From Halopedia, the Halo wiki
Unseal the Hushed Casket is a video promoting the release of Halo: Combat Evolved Anniversary in Halo: The Master Chief Collection on PC. It was released on March 2, 2020.
The video features the soundtrack Yawning Chasm and dialogue from the level The Pillar of Autumn playing over the Halo: Combat Evolved Anniversary menu background animation.
The title alludes to Cortana's transmission to Sam Marcus and Thom Shephard in the opening cutscene of the level The Pillar of Autumn.
Various shots of John-117 in his Cryo chamber play.
MJOLNIR Mark V armor energy shielding can be heard recharging.
The Hunter and the Hunted • Terminal trailer • Cinematic trailer • Remaking the Legend teaser trailer • Remaking the Legend official trailer • Cinematic launch trailer • Launch trailer • Rhythm • Lucky Grunt • Xbox One X Enhanced Trailer • PC Announcement • X019 Halo Reach Launch Trailer • Halo 3: ODST Firefight Teaser • Season 5 Trailer • Season 6 Trailer • Season 7 Trailer • Season 8 Trailer
Announcement trailer • Discover Hope • Signal Detected. Tag Designation: Foe • Step Inside • Campaign Gameplay Premiere • Campaign Gameplay Trailer • E3 2021 showcase segment (A New Generation) • Multiplayer Overview • Multiplayer Season 1 Cinematic Intro • PC Overview • Campaign Overview • The Banished Rise • Forever We Fight • Carry On • Campaign Launch Trailer • Lux Voluspa • Season 2: Lone Wolves Intro Cinematic