The Curse of Oak Island S13 E16: A Mysterious Treasure Found 100 Feet Underground!

Beneath the windswept shores of Oak Island lies a mystery that has refused to fade for more than two centuries. For generations, treasure hunters have dug through collapsing tunnels, flooded shafts, and layers of secrets buried deep beneath this small island off the coast of Nova Scotia. Many believe the legendary money pit holds something extraordinary. Lost treasure, [music] priceless artifacts, or perhaps a piece of history that was intentionally hidden away. Now, in season 13, episode 16, the [music] search takes a dramatic turn.
After months of drilling deeper than ever before, the team makes a surprising discovery nearly 100 ft underground, something that simply shouldn’t be there. It’s not [music] just scattered debris. Instead, it appears to be a man-made structure hidden far below the surface. The discovery raises new questions. Who built it? Why was it buried so deep? And what were they trying to conceal? Using advanced [music] scanning technology and powerful drilling equipment, the team begins to uncover wooden formations, [music] stone alignments, and structural patterns that suggest this might be part of a much larger underground system. If this theory proves true, it could completely change what we think we know about Oak Island. But the deeper they dig, the more dangerous the work becomes. Flood tunnels, unstable shafts, and a mystery that has already claimed six lives remind the team that Oak Island has never given up its secrets easily.
Tonight, they face one critical question. [music] Have they finally uncovered the hidden structure protecting Oak Island’s greatest secret?
Stay with [music] us because what lies 100 ft below the surface might be the closest anyone has ever come to solving the mystery of the curse of Oak Island.
To understand why the discovery in episode 16 is so significant, it’s important to look at the groundwork that season 13 has been building since the very beginning. What happens 100 ft underground in this episode is not a coincidence. Everything the team has done this season has been leading to this moment, [music] even if they didn’t realize exactly where it would take them. Season 13 began with the team more focused and methodical than ever before.
In earlier seasons, they explored many different areas of the island at once, drilling in multiple locations, chasing several theories and spreading their resources widely. This season, however, they adopted a more precise strategy.
They identified [music] the T1 shaft as their primary target and committed to it completely. The team pushed forward with determination and significant resources, showing that they truly believed they were digging in the right place and that they were willing to go as deep as [music] necessary to prove it. That commitment was tested almost immediately. From the beginning, the T1 shaft proved [music] difficult.
Collapsing casings threatened the stability of the dig. Unexpected rock ledges appeared at depths that [music] should have been clear, slowing progress at critical moments. At one point, a near [music] catastrophic underground cave-in shook the crew, not as a dramatic television moment, but as a real reminder that this work involves serious physical risk. Working at [music] such depths is already challenging, but Oak Island adds another complication, its famous flood tunnel system, [music] which constantly threatens to push water into any open shaft. This is far from a simple excavation. [music] Despite these setbacks, there were encouraging signs. The scanning data coming from the T1 [music] shaft looked unlike anything the team had seen before. At deeper levels, they began detecting anomalies, readings that didn’t resemble random geological material, but instead suggested organized patterned [music] formations.
In most situations, this kind of data would immediately suggest a man-made structure. But on Oak Island, where [music] two centuries of searchers have been misled before, the team remained cautious.
>> [music] >> They recorded the anomalies, continued drilling, and waited for clear confirmation. That confirmation finally arrives in episode 16 at a depth of 100 ft. As the team pushes deeper, the atmosphere changes. The energy in the room isn’t just excitement. [music] It’s a focused urgency. Experienced investigators know the feeling when they sense they’re close to something real, and they slow down to make sure they don’t overlook any detail. The team launches a major operational effort in the T1 shaft. Compressed air systems, high-pressure extraction equipment, and [music] precision scanning tools are all used at the same time. They’re not relying on just one method. They’re using everything available to investigate the area. This approach isn’t driven by desperation, but by confidence. After studying the data and reviewing their analysis, the team believes that whatever lies at 100 ft is [music] worth every resource they can bring to the operation. As drilling continues through layers of soil and stubborn geological formations, [music] through the same bedrock that has frustrated generations of treasure hunters, the readings begin to change.
At around 80 ft, something unusual appears in the data. It’s not perfectly clear yet, but it’s enough to make the operators slow down and take a closer look. There’s a shift in density and a pattern in the return signal that doesn’t match the natural geology around it. At 90 ft, the signal becomes stronger. The scans start to reveal edges. Edges that don’t look like natural rock formations. Instead of irregular, random shapes formed over millions of years, these edges appear straight, measured, and deliberate. They look like the kind of shapes created by human design. Then the drill reaches 100 ft and the [music] signal becomes unmistakable.
The room suddenly goes quiet. Someone finally says what everyone is thinking.
You can see that it’s empty. And then a few seconds later, four more words that are even more astonishing. It keeps going deeper in there. Those 10 words carry the weight of more than 200 years of searching. Every expedition that came before, every fortune spent, every tunnel dug, every pump installed, and every risk taken on this island, all of it leads to this moment. The fact that it keeps going tells us something important. This isn’t just a small gap [music] in the rock or a natural pocket underground. It’s a real cavity with measurable space and depth, large enough to extend beyond what the camera or scanner can immediately capture. In other words, what the team [music] has reached at 100 ft appears to be a structure, something that was built, something that was intentionally placed there. The scan data doesn’t show random debris or chaotic geological formations.
Instead, it reveals clear edges, shapes, and [music] patterns. The kind of organized layout that only comes from deliberate construction. There are walls meeting at defined angles, a floor that appears to support the space, and a ceiling that has somehow remained intact despite generations of pressure and disturbance above it. It looks like a hidden chamber, one that someone carefully created, sealed, and left buried. When you think about the engineering required to build something like this, it becomes even more impressive. [music] Constructing a structure 100 ft underground in the 1500s or 1600s would have required enormous effort. Workers would first have to dig a deep shaft, reinforce the walls to prevent collapse, and then build the chambers or tunnels below. After that, they would need to seal everything in a way that could survive centuries of geological pressure, tidal flooding, and future digging attempts. Whoever built this wasn’t improvising. They were following a detailed plan with remarkable precision. That level of sophistication has always been part of the Oak Island mystery. The famous flood tunnel system, channels designed to connect underground areas to the ocean, suggests careful engineering. These tunnels are believed to fill excavation shafts with seawater whenever someone digs too deep. Systems like that aren’t the work of casual treasure hunters or pirates hiding a chest. They point to professionals.
skilled engineers who understood geology, water flow, and long-term structural stability. The structure discovered at 100 ft fits perfectly into that pattern. It doesn’t look like something thrown together in a hurry.
Instead, it appears to be part of a much larger system built to last. Now, the [music] biggest question becomes unavoidable.
What is inside it? This is where the discovery in episode 16 becomes even more remarkable. As the team studies the cavity at 100 ft and tries to understand its size and structure, the scanning equipment detects another signal coming from inside the chamber itself. And that signal changes everything. The scanners detect metal, but not just any metal.
The reading suggests non-ferris metal, meaning it isn’t iron or steel. That’s important because iron or steel could easily come from modern equipment or recent contamination.
Non-ferris metals, however, include materials like copper, bronze, and even gold. Metals commonly used by craftsmen and builders centuries ago. Unlike iron, these metals don’t rust away over time.
They can remain intact for hundreds of years. So, if something made from non-ferris metal is sitting 100 ft underground inside a sealed structure, it’s not likely to be a natural occurrence. It means someone placed it there. Someone carried that metal down into the chamber, positioned it intentionally, sealed the space around it, and then built an entire protective system above it to keep it hidden.
Whatever lies inside that structure must have been incredibly valuable to justify such an effort. Building something this deep and complex would have required tremendous labor, materials, planning, and coordination.
People [music] simply don’t create structures like that to protect something ordinary. They do it to protect something priceless. As the metal signal continues to appear clearly on the scans, the room grows quiet.
Everyone realizes what the data might be pointing to. Finally, one team member says what everyone is thinking. It looks like gold. At that moment, the mystery of Oak Island shifts into an entirely new phase. For more than two centuries, people have asked whether something was actually buried there. The discovery of the structure at 100 ft strongly suggests that the answer is yes. Now the questions become even bigger. Who built it? When did they build it? And why did they go to such extraordinary lengths to hide whatever is inside?
Earlier discoveries in season 13 may already be pointing toward possible answers. At one point in the season, the team uncovered what appears to be a pickaxe dating back to the 1500s.
It wasn’t decorative. It was a working tool, the kind used by someone digging or constructing something deep underground. They also discovered carefully built stone structures in areas that look completely ordinary on the surface. And in the island swamp, [music] the team uncovered a cobblestone pathway, a deliberately built road that seems to lead toward lot 8. That pathway suggests that heavy materials were once transported across the island along planned routes. Taken together, these clues paint a picture of a large organized operation. Not a small group working quickly in secret, but a well-funded and carefully managed project carried out by people with the knowledge, manpower, and resources to build something meant to last underground for centuries.
Many theories have circulated about Oak Island over the years. Some suggest connections to the Knights Templar.
Others mention the Knights of Malta, early European explorers operating outside official historical records [music] or even state level operations meant to hide vast wealth. While these theories differ, they all have one thing in common. They involve organizations powerful enough to carry [music] out a project of this scale. Groups with the technical knowledge and resources needed to construct something like the structure found at 100 ft. What seems increasingly clear is that this wasn’t the work of pirates. Pirates didn’t build complex flood tunnel systems. They didn’t engineer sealed underground chambers hundreds of feet below the ground with carefully hidden metal deposits. Pirates [music] buried chests and hoped they could find them again.
Whoever built the structure discovered in episode 16 was operating on a completely different level. They were creating something permanent, something designed to remain hidden unless very specific conditions were met, or perhaps never to be discovered at all. And the fact that it may have remained hidden for more than two centuries is proof of just how skilled those builders truly were. If the metal reading detected inside the underground structure is confirmed, and if it truly matches materials from the medieval era, as many clues from season 13 seem to suggest, then Oak Island could become far more than a local legend. It could transform into a site of global historical importance. Such a discovery would point to organized activity, advanced engineering, and possibly even transatlantic connections that challenge what we currently understand about early history on this continent. For years, many scholars and archaeologists have kept a cautious distance from the Oak Island mystery. But a structure discovered 100 ft underground, combined with the evidence gathered this season, may make it impossible to ignore. This discovery demands serious attention. But beyond the data, the scans, and the historical theories, there’s another powerful element to episode 16, the human story behind it. Throughout the entire series, Rick Lagginina has spoken about what truly drives him. It isn’t just the hope of finding gold, coins, or jewels. What Rick has always wanted is something even more meaningful. A single undeniable piece of evidence that proves the Oak Island mystery is real. Proof that something important truly happened on this island. Proof that the stories and legends are not just myths, but fragments of history waiting to be confirmed. For Rick, the search has always been about discovering the truth.
And in episode 16, when he stands in front of the data showing a sealed structure 100 ft underground with a non-ferris metal reading inside, it feels like the moment he has been searching for. He becomes quiet. Not the quiet of disappointment that viewers of Oak Island have seen many times before, but a different kind of silence. It’s the silence of someone who has believed in something for a very long time and is now watching that belief begin to turn into reality. It’s the quiet moment when a lifelong hope finally feels within reach. Marty Lagginina reacts differently, but just as powerfully.
While Rick approaches the discovery with emotional and philosophical weight, Marty approaches it through analysis and logic. He studies the data carefully, processing every detail with the disciplined mindset of an engineer.
Throughout the series, Marty has often been the voice of caution, the one asking, “Is this really what we think it is?” before anyone gets too excited.
[music] But in episode 16, even Marty struggles to find another explanation. The evidence is clear. The structure is real. The underground void is confirmed, and the metal reading remains steady and strong. When Rick’s deep belief and Marty’s analytical thinking finally point to the same conclusion, the moment becomes incredibly powerful. After 13 seasons of exploring the same mystery from two very different perspectives, the brothers arrive at the same realization at the same time, and the rest of the team deserves recognition as well.
Season 13 has been filled with challenges. Cave-ins, collapsing casings, and [music] stubborn rock ledges that slowed progress again and again.
The conditions were difficult enough to stop a less determined group. But this team kept going. They continued digging, scanning, and analyzing even when the results were uncertain. Their success in episode 16 is not just the result of persistence. It’s the result of persistence combined with skill, careful planning, [music] and real expertise.
So, what exactly has episode 16 revealed? First, a sealed structure located about 100 ft underground. one with clear edges, shapes, and patterns that strongly suggest intentional design. Second, a large underground void that continues beyond the camera’s immediate reach, hinting that this may not be just a single room, but possibly part of a larger system. Third, a strong non-ferris metal signal detected inside that structure, something that cannot easily be explained by natural geological processes. And finally, two brothers standing in front of this discovery. After years of searching, now closer than ever to the truth they always believed was hidden there. For more than 200 years, Oak Island has been known as the mystery that almost reveals itself. It has always offered just enough clues to keep people searching while resisting every attempt to uncover its secrets.
Episode 16 may not solve the entire mystery in one moment. The island is far too complex for that. But it does provide something different, something undeniable, a real structure, a space that continues deeper, and a signal shining back from far beneath the ground. The story of Oak Island doesn’t end here. Mysteries that have lasted for centuries are rarely solved in a single episode. But episode 16 represents a turning point. The question is no longer simply whether something is buried on the island. Now the real questions are how large is it, [music] how old is it, and what does it reveal about the people who built it. That shift from wondering if anything exists to studying something that clearly does is a huge step forward. It’s the moment Rick Lginina has been working toward for more than 13 years. It’s the moment that generations of treasure hunters before him hoped to reach, but never quite achieved.
For centuries, Oak Island has held its [music] secrets deep underground, waiting for someone determined enough, skilled enough, and patient enough to finally reach them. Now, the team may be closer than anyone has ever been. What do you think is inside that underground structure? Could it be treasure, historical relics, or something completely unexpected that history books have never mentioned? And do you believe the team is finally close enough to uncover the truth?
Let us know your thoughts. And if you enjoy exploring mysteries like this, be sure to subscribe to the Timefold channel. And don’t forget to like the video.