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During the bulk of the concluding season of *Stranger Things*, the young Holly Wheeler and Max Mayfield find themselves trapped within a psychic prison forged from the memories of the villain Henry. The search for a way out in episode 6 leads them to experience a defining event from Henry's youth—an event that potentially carries the means to overcome him for good.

Heads Up: This article details significant events for *Stranger Things* season 5, volume 2.

A Journey Into the Mine Shaft

Upon meeting Max in the psychic realm dubbed Camazotz, Max reveals she is sheltering in a chamber that Henry avoids at all costs. An accidental discovery a spyglass taken from Henry's old home allows Holly to realize that the source of fear lies not within the cave. When she lines up her view through the cap, she and Max suddenly fall into a deep mine shaft.

They watch a Henry as a boy come across an wounded, fearful individual. Attempting assistance, the man panics and shoots, hitting him in the hand. In a desperate act of self-defense, Henry ends the threat with a rock. "Is this what corrupted him?" Holly questions through tears. The answer is affirmative, but the trauma wasn't just a simple act of survival.

Like many elements of the final season, the truth about the mine shaft incident is detailed in the live show the prequel play.

The Philadelphia Experiment and Stolen Research

The play reveals the infamous Philadelphia Experiment, which allegedly sent a vessel into a dimension dubbed the Abyss. It faced creatures, and the sole survivor was the ship's commander, who returned in a vegetative state with an different blood composition.

The captain's son, Martin Brenner, sought to replicate this dimensional breach in Nevada. However, a treacherous employee pilfered lab samples to sell to the Russian agents, who were keen to start their parallel research. This spy in the mine shaft is that employee.

Unlocking the Mystery

Based on what is known about his research, the briefcase most likely held samples of the altered blood. As shown, Henry is bleeding from his hand. He likely becomes contaminated upon contact with the blood, causing the origin of his telekinetic gifts—traits he would genetically impart to the children Brenner would experiment on.

Another possibility, the box could have held dark matter that was destined to travel to the secret facility, where it helps stabilize the mirror dimension. The stage play explains that Henry was transported in the Abyss, coming back after half a day as a different person. From then on, he fights the whispers of a malevolent force, similar to how Will was influenced by the entity in season 2.

A Weaponized Emotion

The reason Henry avoids the cave of that cave highlights how profoundly traumatic the encounter was for him. Even as he controls the army of monsters and seeks to merge the Abyss into Hawkins, a part of him still exists. The villain weaponizes terror, and the series is building toward a final confrontation between the monster and Will, who has confronted his own deepest fears to fortify himself.

Will's growth has neutralized a key tactic of Vecna. Furthermore, Will now understands what Vecna himself fears, which could provide a key upper hand in the series finale to come.