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Throughout a large portion of the concluding season of *Stranger Things*, the young Holly Wheeler and Max Mayfield are imprisoned inside a mental fortress forged from the memories of the villain Henry. The search for a way out in episode 6 leads them to witness again a traumatic incident from Henry's youth—an event that potentially carries the key to defeating him permanently.

Editor's Note: This discussion details significant events for the second part of the final season.

A Journey Into the Mine Shaft

When she finds Max in the world called Camazotz, it becomes clear she is taking refuge in a grotto that Henry strangely fears. By leaving the lens cap on a telescope taken from Henry's old home allows Holly to realize that the danger lies not within the cave. Matching her view with the shape, she and Max tumble into a abandoned tunnel.

They watch a child version of Henry come across an injured and paranoid man. Attempting assistance, the man fires a gun, hitting him in the hand. Fighting for his life, Henry ends the threat with a rock. "Was this the turning point?" Holly wonders aloud. The answer is affirmative, but the act involved more than a defensive killing.

Similar to other plot points in volume 2, the truth about the mine shaft incident originates in the live show the prequel play.

The Philadelphia Experiment and Stolen Research

The play reveals the legendary naval test, which reportedly teleported a warship into a plane later called the Abyss. Demogorgons assaulted it, and the only one to return was the captain, who emerged in a unresponsive state with an altered blood type.

The captain's son, Martin Brenner, attempted to recreate this dimensional breach in the Nevada desert. However, a treacherous employee took experimental components to sell to the Communist spies, who were eager to begin their version of the tests. That traitor in the cavern was that very thief.

Unlocking the Mystery

Considering what is understood of Brenner's work, the case almost certainly contained some of Captain Brenner's infected blood. At that moment, Henry is already bleeding. It's probable he was infected upon opening the case, causing the awakening of his powers—powers he would genetically impart to the test subjects Brenner would experiment on.

A second theory, the box could have held strange particles that later made its way to Hawkins Laboratory, where it helps stabilize the Upside Down. *The First Shadow* reveals that the boy somehow wound up in the Abyss, coming back 12 hours later with a new blood type and personality. From then on, he struggles with the control of a sinister presence, similar to how Will Byers was possessed by the shadow monster in the past.

Confronting Terror

The reason Henry avoids the cave of that cave highlights how deeply scarring the event was for him. Even as he commands the collective consciousness and seeks to merge the Abyss into Hawkins, a part of him remains. The villain weaponizes terror, and the narrative points to a climactic battle between Vecna and Will, who has overcome his personal demons to fortify himself.

His confrontation has neutralized a key tactic of Vecna. Furthermore, Will now is aware of what the monster's own weakness, which could provide a critical advantage in the series finale to come.