A Colossal Problem

Event: A Colossal Problem is a public event in Fallout 76, introduced in the The Legendary Run update. It is described as intended for teams of at least eight high-level and properly equipped players.

Stage 1
The 30-minute event timer starts as soon as a nuke is launched with Monongah Mine in its blast radius. One can join the event and is subsequently teleported into the mine's interior. From there, the player character has five minutes to make their way to the arena entrance and prepare for the fight.

It is possible to repair, modify, or craft equipment using workbenches at the entrance and in the large cavern after the tunnels. Several notes and a holotape can be found and a total of three wendigo spawns can be killed. After the time has passed, the rubble on the right-hand side of the large cavern will collapse, allowing for further descent into the mine.

Stage 2
Once the initial five-minute timer is up, the one-way entrance to the cavern below will open. On the far side of the cavern is Earle Williams, who has transformed into a wendigo colossus and will immediately engage in combat. Earle has high damage resistance and a large health pool. Upon being reduced to half health for the first time, he will mutate, regaining all hit points.

The group must fight Earle while simultaneously killing off waves of wendigo spawns that Earle attracts. Additional threats include Earle's ranged screech attack that cause the Uncontrollable Fear effect and environmental hazards in the form of burning embers that fall from the ceiling, causing 25 fire damage for 3 seconds.

Stage 3
After Earle has been defeated, the mine will start collapsing, giving a two-minute window to make the escape. Earle can be looted before heading up the sloped tunnel marked by an "EXIT" sign and warning lights, killing or running past any wendigo spawns and auto-miners on the way out. Exiting the mine will conclude the quest, awarding experience, and loot. If Something Sentimental is still an active quest, Earle's pocket watch will be found on his remains, allowing the quest to progress further.

Should time run out and Earle is still alive, the quest fails and player characters are teleported to the Monongah Mine exterior, but will not result in rewards. Dying during the fight results in respawning in the large cavern with the previously blocked mine shaft, dropping down again to rejoin the fight.

Behind the scenes

 * Victoria McCreary was the main quest designer for the event.
 * Although the quest's existence was known prior to the release of Wastelanders, it was ultimately not released on April 14, 2020, alongside the update's first release. It was finally activated on August 18 in The Legendary Run patch 1.3.3.31, following further testing in the game's Private Test Server. It was originally slated to be included with patch 20, then patch 21, but was delayed both times to allow for polishing and internal testing.
 * The quest was initially only accessible for PC players, as the hotfix had only been applied on that platform. It is currently available on all platforms.

Bugs
Entering a suit of power armor right as the screen fades to black following the event will allow the player to remain in Monongah Mine indefinitely.