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For much of the fifth and final season of *Stranger Things*, Holly Wheeler and Max are held captive within a psychic prison constructed from the past of the villain Henry. The search for an escape route in the pivotal sixth episode leads them to witness again a life-altering moment from Henry's childhood—a moment that may just hold the means to overcome him for good.

Editor's Note: This article contains major spoilers for the second part of the final season.

The Discovery in the Tunnel

Upon meeting Max in the mental landscape called Camazotz, Max reveals she is hiding out in a chamber that Henry avoids at all costs. A clever observation a viewing device 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 tumble into a abandoned tunnel.

In this place, they observe a Henry as a boy encounter an wounded, fearful individual. When Henry tries to help, the man reacts violently, hitting him in the hand. Fighting for his life, Henry kills the man with a rock. "Was this the turning point?" Holly questions through tears. It was a factor, but the act went deeper than a simple act of survival.

Similar to other plot points of the final season, the significance of the events in the tunnel was first explored the stage play The First Shadow.

The Philadelphia Experiment and A Spy's Mission

*The First Shadow* opens with the 1943 event, which allegedly sent a warship into a dimension known as the Abyss. It faced creatures, and the lone returnee was the captain, who emerged in a vegetative state with an different blood composition.

The captain's son, a young Martin Brenner, attempted to recreate this dimensional breach in the Nevada desert. One of his scientists pilfered lab samples to sell to the Communist spies, who were keen to start their own interdimensional projects. This spy in the cavern was that very thief.

Unlocking the Mystery

Based on what is understood of the doctor's experiments, the case would assuredly have samples of the unique blood type. In the scene, Henry is bleeding from his hand. He likely becomes contaminated upon opening the case, which triggered the origin of his telekinetic gifts—powers he would inadvertently transfer to the kids under Brenner's care.

A second theory, the case could have held strange particles that was destined to travel to the secret facility, where it maintains the stability of the Upside Down. The stage play explains that Henry somehow wound up in the Abyss, returning hours later as a different person. From then on, he fights the control of a sinister presence, similar to how Will Byers was influenced by the shadow monster in season 2.

The Power of Fear

Henry's enduring terror linked to that memory highlights how utterly horrifying the incident was for him. While he controls the collective consciousness and seeks to merge the Abyss into Hawkins, a piece of the scared boy remains. Vecna uses fear, and the series is building toward a showdown between him and Will, who has confronted his own deepest fears to gain strength.

This journey has effectively disarmed Vecna. More importantly, Will now is aware of what the monster's own weakness, which could provide a critical advantage in the ultimate battle to come.