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For much of the concluding season of *Stranger Things*, the young Holly Wheeler and Max are imprisoned inside a mental fortress forged from the recollections of the villain Henry. Their quest for a way out in the pivotal sixth episode forces them to experience a life-altering moment from Henry's youth—an event that could contain the means to overcome him permanently.

Heads Up: The following contains major spoilers for *Stranger Things* season 5, volume 2.

Unearthing the Secrets of the Tunnel

After locating Max in the psychic realm called Camazotz, it becomes clear she is taking refuge in a grotto that Henry avoids at all costs. A clever observation a telescope found in Henry's old home allows Holly to realize that the source of fear lies not within the cave. By aligning her view to the cut-out, she and Max plummet into a abandoned tunnel.

There, they witness a young, eight-year-old Henry come across an injured and paranoid man. As the boy offers aid, the man reacts violently, striking Henry in the hand. Fighting for his life, Henry strikes the man down with a rock. "Is this what corrupted him?" Holly asks tearfully. The answer is affirmative, but the trauma went deeper than a defensive killing.

In keeping with mysteries this season, the full story behind the events in the tunnel originates in the live show The First Shadow.

An Interdimensional Incident and Secret Science

*The First Shadow* opens with the legendary naval test, which allegedly sent a warship into a plane later called the Abyss. It faced creatures, and the only one to return was the ship's commander, who came back in a catatonic condition with an different blood composition.

That survivor's offspring, the future Dr. Brenner, sought to replicate this experiment in the Nevada desert. However, a treacherous employee pilfered lab samples to hand over to the Soviets, who were desperate to launch their parallel research. The man in the tunnel was that very thief.

So, What's in the Case?

Given what is understood of Brenner's work, the container would assuredly have vials of the unique blood type. In the scene, Henry is wounded and bleeding. It's probable he was infected upon handling the contents, causing the development of his psychic abilities—traits he would inadvertently transfer to the kids Brenner would experiment on.

A second theory, the container could have held exotic matter that eventually found its way to Hawkins Laboratory, where it acts to anchor the Upside Down. *The First Shadow* reveals that Henry ended up in the Abyss, returning after half a day with a new blood type and personality. As a youth, he struggles with the control of a sinister presence, reminiscent of how Will was influenced by the shadow monster in an earlier season.

Confronting Terror

Henry's enduring terror linked to that memory highlights how profoundly traumatic the encounter was for him. While he commands the army of monsters and seeks to merge the Abyss into Hawkins, a part of him still exists. Vecna uses fear, and the show is setting up a final confrontation between the monster and Will, who has overcome his personal demons to fortify himself.

His confrontation has effectively disarmed Vecna. Furthermore, Will now understands what his enemy truly fears, potentially giving him a decisive edge in the ultimate battle that awaits.