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For much of the fifth and final season of the popular Netflix show, Holly Wheeler and Max Mayfield are held captive within a psychic prison constructed from the recollections of Henry Creel. Their quest for a way out in "Escape from Camazotz" forces them to experience a defining event from Henry's childhood—an event that may just hold the means to overcome him permanently.

Editor's Note: This article reveals crucial plot points for the concluding episodes.

A Journey Into the Tunnel

When she finds Max in the mental landscape called Camazotz, it becomes clear she is taking refuge in a chamber that Henry avoids at all costs. A clever observation a spyglass found in Henry's old home helps Holly understand that the true terror lies not within the cave. Matching her view with the shape, she and Max plummet into a subterranean passage.

They watch a Henry as a boy encounter an wounded, fearful individual. Attempting assistance, the man panics and shoots, striking Henry in the hand. To protect himself, Henry kills the man with a rock. "Is this what corrupted him?" Holly asks tearfully. It was a factor, but the event involved more than a simple act of survival.

Like many elements this season, the truth about the mine shaft incident is detailed in the stage play Stranger Things: The First Shadow.

An Interdimensional Incident and Secret Science

This backstory explains the infamous Philadelphia Experiment, which reportedly teleported a U.S. Navy ship into a dimension dubbed the Abyss. The ship was attacked, and the sole survivor was the ship's commander, who came back in a catatonic condition with an entirely new blood.

This man's son, a young Martin Brenner, sought to replicate this experiment in Nevada. However, a treacherous employee pilfered lab samples to hand over to the Communist spies, who were desperate to launch their parallel research. The man in the mine shaft is that employee.

The Briefcase's Contents

Based on what is understood of the doctor's experiments, the briefcase would assuredly have samples of the unique blood type. As shown, Henry is already bleeding. It's probable he was infected upon handling the contents, causing the awakening of his powers—abilities he would inadvertently transfer to the children Brenner would experiment on.

A second theory, the container could have held strange particles that later made its way to the secret facility, where it maintains the stability of the mirror dimension. The prequel shows that the boy somehow wound up in the Abyss, returning 12 hours later fundamentally changed. Throughout the play, he battles the influence of a malevolent force, similar to how Will Byers was possessed by the entity in season 2.

A Weaponized Emotion

Henry's enduring terror of that cave shows how deeply scarring the incident was for him. While he orchestrates the Hive Mind and seeks to merge the Abyss into Hawkins, a part of him lingers. The villain weaponizes terror, and the show is setting up a showdown between him and Will, who has overcome his greatest terrors to fortify himself.

This journey has taken a weapon from Vecna. More importantly, Will now knows what his enemy truly fears, and this may grant a critical advantage in the ultimate battle that awaits.