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For much of the concluding season of the popular Netflix show, the young Holly Wheeler and Max Mayfield are imprisoned in a realm of memories forged from the recollections of Henry Creel. The search for freedom in the pivotal sixth episode has them experience a traumatic incident from Henry's early years—a discovery that could contain the means to overcome him permanently.

Spoiler Warning: This discussion details significant events for *Stranger Things* season 5, volume 2.

A Journey Into the Mine Shaft

Upon meeting Max in the mental landscape known as Camazotz, it becomes clear she is sheltering in a cave that Henry avoids at all costs. By leaving the lens cap on a spyglass pilfered from Henry's old home helps Holly understand that the danger lies outside of the cave. When she lines up her view through the cap, she and Max tumble into a abandoned tunnel.

In this place, they observe a child version of Henry find an man who is hurt and scared. When Henry tries to help, the man fires a gun, hitting him in the hand. In a desperate act of self-defense, Henry kills the man with a rock. "Did this make Henry evil?" Holly wonders aloud. It was a factor, but the trauma wasn't just a defensive killing.

Like many elements of the final season, the truth about the mine shaft incident is detailed in the theatrical production Stranger Things: The First Shadow.

An Interdimensional Incident and Stolen Research

The play reveals the infamous Philadelphia Experiment, which transported a vessel into a dimension later called the Abyss. It faced creatures, and the lone returnee was the ship's commander, who returned in a unresponsive state with an entirely new blood.

This man's son, a young Martin Brenner, wanted to repeat this phenomenon in Nevada. However, a treacherous employee pilfered lab samples to sell to the Communist spies, who were keen to start their own interdimensional projects. The man in the cavern is the one who stole the materials.

Unlocking the Mystery

Based on what is revealed about Brenner's work, the briefcase most likely held some of the unique blood type. As shown, Henry is already bleeding. It's probable he was infected upon contact with the blood, leading to the development of his psychic abilities—traits he would inadvertently transfer to the children in Hawkins Lab.

Alternatively, the box could have held exotic matter that later made its way to the secret facility, where it maintains the stability of the parallel world. *The First Shadow* reveals that the boy somehow wound up in the Abyss, coming back after half a day fundamentally changed. Throughout the play, he struggles with the whispers of a malevolent force, much like how Will Byers was controlled by the Mind Flayer in the past.

The Power of Fear

Henry's enduring terror associated with the mine demonstrates how utterly horrifying the encounter was for him. Even as he commands the army of monsters and works to collapse the Abyss into Hawkins, a piece of the scared boy remains. The villain weaponizes terror, and the narrative points to a showdown between Vecna and Will, who has confronted his greatest terrors to fortify himself.

This journey has taken a weapon from Vecna. Furthermore, Will now is aware of what Vecna himself fears, which could provide a decisive edge in the series finale to come.