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Home » Transcript of Cassie Coppersmith Interview: Joe Rogan Experience #2528

Transcript of Cassie Coppersmith Interview: Joe Rogan Experience #2528

The following is the full transcript of researcher Cassie Coppersmith’s interview on Joe Rogan Experience #2528, July 21, 2026.

EDITOR’S NOTES: In this episode of the Joe Rogan Experience, Joe sits down with Cassie Coppersmith, an independent researcher focused on ancient civilizations and archaeological mysteries, and host of the Secrets in Stone podcast. Together they explore remarkable evidence of advanced stoneworking techniques, anomalous artifacts, and global sites that challenge conventional historical timelines. The conversation digs into everything from precision-machined jade objects and elongated skulls to massive ancient engineering feats revealed by modern technology.

Introduction and Ancient Chinese Artifacts

JOE ROGAN: How are you?

CASSIE COPPERSMITH: Great, how are you doing, Joe?

JOE ROGAN: Very nice to meet you.

CASSIE COPPERSMITH: Nice to meet you.

JOE ROGAN: I’ve enjoyed your content online.

CASSIE COPPERSMITH: Thank you.

JOE ROGAN: I got first introduced to you by a video you did with— his channel’s Megalithic Marvels.

CASSIE COPPERSMITH: Yes.

JOE ROGAN: Yeah, and it was about ancient Chinese artifacts that don’t make any sense.

CASSIE COPPERSMITH: Yes.

JOE ROGAN: And it was so fascinating. The moment I saw it, I reached out to my guy. I was like, I got to talk to her because this is crazy. So please explain to people what these artifacts are and what’s so bizarre about them.

CASSIE COPPERSMITH: I first saw these artifacts in the British Museum. So they have an entire whole wall full of them. And they’re made of nephrite jade, which is an extremely hard stone. And they just look machined. They look way too precise for the tools that they say built them. So I started doing some research. I haven’t been to the site in China. It was built by the Liangzhu culture, or so archaeologists say.

But it’s 2 different kinds of artifacts that are really famous. One is called a Cong tube, which is a tall tube that’s circular in the middle and square on the outside, and extremely precise geometry. The other one are these big round Bi discs that almost look like a giant flat donut that are perfectly flat on top. You know, there’s the precision versions of these just like you see all over the world, and there are versions that are much cruder.

So it almost seems like this civilization had this— my theory is this: these were not unlike the hard stone vases in Egypt. So it was something that this culture either was gifted or found, and it turned into a very cherished object, like a grave good for them. So you find these tombs in Liangzhu, China that have literally thousands of these jade artifacts in them. And it’s not unlike the hard stone vases that you see in Egypt where you find those in the graves as well.

JOE ROGAN: So what’s the timeline where these pieces are attributed to?

CASSIE COPPERSMITH: So these are really old. I mean, the earthworks and the community around the Liangzhu culture is securely dated by archaeologists to like 3400 BC. And then, you know, just so— it’s about the same, actually, as the graves that were in Egypt with the hard stone vases. So it’s very, very old.

JOE ROGAN: And at the time of this culture, what were their tools? Like, do we know?

CASSIE COPPERSMITH: Well, the archaeologists say that it was made with strings. So they would take strings with sand or some sort of an abrasive, and they would cut the jade that way. And then they would use copper tools, stone hammers, those kinds of things to shape it. So the explanation—

JOE ROGAN: Giant smile on your face—

CASSIE COPPERSMITH: The explanation doesn’t make a lot of sense. And even, you know, the hole down the middle of the Bi disc is a perfect— I mean, you can see the drill marks on the inside of the Bi disc.

Examining the Artifacts

JOE ROGAN: Do we have some images of these things?

CASSIE COPPERSMITH: Yes. Take a look at them, Jamie. I have a China folder because the images on—

JOE ROGAN: And by the way, that channel, Megalithic Marvels, Derek’s channel, excellent. Really fun.

CASSIE COPPERSMITH: So great.

JOE ROGAN: Great stuff.

CASSIE COPPERSMITH: Yeah. Derek is the one that got me into all this.

JOE ROGAN: Shout out to Derek.

CASSIE COPPERSMITH: Shout out to Derek.

JOE ROGAN: So this is— how do you say it? How do you pronounce that? Bi Disc. Bi Disc. B-I Disc. And how big is this?

CASSIE COPPERSMITH: So that thing’s about 9 inches across. Perfectly circular, perfectly flat surface on the top.

JOE ROGAN: Like measured to what tolerance?

CASSIE COPPERSMITH: You know, I don’t know the answer to that, and I don’t know that there have been a lot of deep scientific studies on the precision of these. The archaeologists assume that this culture made them with bamboo, you know, bamboo and strings.

JOE ROGAN: Okay.

CASSIE COPPERSMITH: So yeah, that picture, Jamie— you can see the inside of the actual artifact in the bottom right. That’s drilled.

JOE ROGAN: Yeah, right.

CASSIE COPPERSMITH: And the one on the left is an experiment these archaeologists ran with a bamboo core down the middle of the jade. And you can just see the difference between the two.

JOE ROGAN: How far did they get down with the bamboo experiment?

CASSIE COPPERSMITH: Oh, all the way through.

JOE ROGAN: They got all the way through. How long did that take?

CASSIE COPPERSMITH: I don’t know the answer to that. There was an archaeologist that did an experiment in the 1930s, and they used these strings with the abrasives to cut off a piece of jade that was the size of a basketball. And it took them a week to cut the string all the way through that piece of jade.

JOE ROGAN: Hmm. So the difference— for the people that are listening— so there’s the bamboo experiment where they drilled into something with a bamboo and cord and some, what else did they use?