What are the key takeaways from this Stuff You Should Know episode?

Key insights include: **Conspiracy Origin:** The entire Philadelphia Experiment legend traces to a single source: Carl Allen, also known as Carlos Miguel Allende, who began sending letters to UFO author Morris Jessup in 1956 — roughly 13 years after the alleged events. No corroborating witnesses, names, or dates were ever produced. Allen himself admitted he might need narco-hypnosis to recall specifics.; **Degaussing Misinterpretation:** The USS Eldridge underwent degaussing — a real, classified wartime process wrapping ships in hundreds of meters of cable and running high-voltage electrical charges through them to neutralize magnetic signatures against German sea mines. Sailors overheard saying their ship would be made "invisible" to mines likely seeded the teleportation myth through misunderstood secondhand conversation.; **Ship Log Evidence:** A 1999 reunion of actual USS Eldridge crew members confirmed the ship's log places the vessel in Brooklyn — not Philadelphia — on the dates the experiment allegedly occurred. The ship never disappeared; it used a restricted military canal, the Delaware-Chesapeake Canal, to make a Philadelphia-Norfolk round trip in approximately six hours, not two days.

What did Sysk Gets Weird Playlist discuss on Stuff You Should Know?

Josh Clark and Chuck Bryant examine the Philadelphia Experiment conspiracy theory — the 1943 claim that the USS Eldridge vanished from Philadelphia's naval shipyard, teleported to Norfolk, Virginia, and time-traveled back — tracing the story's origins to one mentally unstable merchant seaman named Carl Allen. Key topics include: **Conspiracy Origin:** The entire Philadelphia Experiment legend traces to a single source: Carl Allen, also known as Carlos Miguel Allende, who began sending letters to UFO author Morris Jessup in 1956 — roughly 13 years after the alleged events. No corroborating witnesses, names, or dates were ever produced. Allen himself admitted he might need narco-hypnosis to recall specifics.; **Degaussing Misinterpretation:** The USS Eldridge underwent degaussing — a real, classified wartime process wrapping ships in hundreds of meters of cable and running high-voltage electrical charges through them to neutralize magnetic signatures against German sea mines. Sailors overheard saying their ship would be made "invisible" to mines likely seeded the teleportation myth through misunderstood secondhand conversation..

How long is this episode of Stuff You Should Know?

This episode is 48 minutes long. SignalCast provides an AI-generated summary so you can get the key insights in about 3 minutes.

Stuff You Should Know

SYSK Gets Weird Playlist: What was the Philadelphia Experiment?

September 18, 2026

48 min episode · 2 min read

Sysk Gets Weird Playlist

Episode

48 min

Read time

2 min

Topics

Psychology & Behavior, Science & Discovery, Books & Authors

AI-Generated Summary

Published Sep 18, 2026

Key Takeaways

✓Conspiracy Origin: The entire Philadelphia Experiment legend traces to a single source: Carl Allen, also known as Carlos Miguel Allende, who began sending letters to UFO author Morris Jessup in 1956 — roughly 13 years after the alleged events. No corroborating witnesses, names, or dates were ever produced. Allen himself admitted he might need narco-hypnosis to recall specifics.
✓Degaussing Misinterpretation: The USS Eldridge underwent degaussing — a real, classified wartime process wrapping ships in hundreds of meters of cable and running high-voltage electrical charges through them to neutralize magnetic signatures against German sea mines. Sailors overheard saying their ship would be made "invisible" to mines likely seeded the teleportation myth through misunderstood secondhand conversation.
✓Ship Log Evidence: A 1999 reunion of actual USS Eldridge crew members confirmed the ship's log places the vessel in Brooklyn — not Philadelphia — on the dates the experiment allegedly occurred. The ship never disappeared; it used a restricted military canal, the Delaware-Chesapeake Canal, to make a Philadelphia-Norfolk round trip in approximately six hours, not two days.
✓Credibility Amplifiers: Three specific details kept the story alive for decades: two Office of Naval Research officers showed up unannounced at Jessup's home asking about Allen's letters; Jessup died by suicide the day he reportedly told a friend he had made a breakthrough in the case; and a 1979 book presenting the experiment as nonfiction was excerpted in newspapers nationwide.
✓Conspiracy Theory Anatomy: Jacques Vallée, the astrophysicist who inspired the French scientist character in Close Encounters of the Third Kind, identified a replicable pattern: physical media — a movie, a photograph, a book — causes previously silent "witnesses" to emerge. The 1984 Philadelphia Experiment film directly triggered multiple new claimants, including one who stated he time-traveled from 1943 to 1983 as a physicist aboard the Eldridge.

What It Covers

Josh Clark and Chuck Bryant examine the Philadelphia Experiment conspiracy theory — the 1943 claim that the USS Eldridge vanished from Philadelphia's naval shipyard, teleported to Norfolk, Virginia, and time-traveled back — tracing the story's origins to one mentally unstable merchant seaman named Carl Allen.

Key Questions Answered

•Conspiracy Origin: The entire Philadelphia Experiment legend traces to a single source: Carl Allen, also known as Carlos Miguel Allende, who began sending letters to UFO author Morris Jessup in 1956 — roughly 13 years after the alleged events. No corroborating witnesses, names, or dates were ever produced. Allen himself admitted he might need narco-hypnosis to recall specifics.
•Degaussing Misinterpretation: The USS Eldridge underwent degaussing — a real, classified wartime process wrapping ships in hundreds of meters of cable and running high-voltage electrical charges through them to neutralize magnetic signatures against German sea mines. Sailors overheard saying their ship would be made "invisible" to mines likely seeded the teleportation myth through misunderstood secondhand conversation.
•Ship Log Evidence: A 1999 reunion of actual USS Eldridge crew members confirmed the ship's log places the vessel in Brooklyn — not Philadelphia — on the dates the experiment allegedly occurred. The ship never disappeared; it used a restricted military canal, the Delaware-Chesapeake Canal, to make a Philadelphia-Norfolk round trip in approximately six hours, not two days.
•Credibility Amplifiers: Three specific details kept the story alive for decades: two Office of Naval Research officers showed up unannounced at Jessup's home asking about Allen's letters; Jessup died by suicide the day he reportedly told a friend he had made a breakthrough in the case; and a 1979 book presenting the experiment as nonfiction was excerpted in newspapers nationwide.
•Conspiracy Theory Anatomy: Jacques Vallée, the astrophysicist who inspired the French scientist character in Close Encounters of the Third Kind, identified a replicable pattern: physical media — a movie, a photograph, a book — causes previously silent "witnesses" to emerge. The 1984 Philadelphia Experiment film directly triggered multiple new claimants, including one who stated he time-traveled from 1943 to 1983 as a physicist aboard the Eldridge.

Notable Moment

A sailor who debunked the bar-fight disappearance story — one of the experiment's most cited "evidence" points — revealed he was one of the men who vanished. He was underage, and a sympathetic bartender quietly removed him and another minor through a back door.

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Episode Transcript

00:00:03 Speaker 1: Hi there, friends. It's Josh. Finally, I'm here and I'm presenting first our episode on the Philadelphia Experiment. It's a bizarre conspiracy theory that in 1943, the USS Eldridge, which is a real destroyer from the real U.S. Navy, suddenly disappeared from port and instantaneously reappeared miles away. And that when it did reappear, things weren't quite right with it. I'll leave it to past me and Chuck to give the details in this fascinating episode. 00:00:40 Speaker 2: Welcome to Stuff You Should Know from HowStuffWorks.com. 00:00:45 Speaker 1: Hey, and welcome to the podcast. I'm Josh Clark. There's Charles W. Chuck Bryant. And this is a special edition of Stuff You Should Know because Jerry has transmogrified into guest producer Noel. 00:00:59 Speaker 2: Which is... requires quite a bit of alchemy. 00:01:03 Speaker 1: It does. 00:01:04 Speaker 2: You know? 00:01:04 Speaker 1: And a little bit of alcohol. Yeah. 00:01:06 Speaker 2: And some, like a magnificent brown bearded chia pet. 00:01:13 Speaker 1: Nice. There's a woodchuck waving from there. Looking good, Noel. 00:01:18 Speaker 2: Yeah, Jerry's gone on a top secret mission. Can't talk about it, so it makes it top secret. 00:01:24 Speaker 1: You're talking about it right now. 00:01:25 Speaker 2: But she's coming back at some point, don't worry. 00:01:27 Speaker 1: Yeah. 00:01:28 Speaker 2: She's not left us forever. 00:01:30 Speaker 1: No, this is a stint. by guest producer no we'll have to make a suite out. 00:01:34 Speaker 2: Of it yeah uh noel produced shows you should. 00:01:37 Speaker 1: Know summer of sam death suite noel. 00:01:41 Speaker 2: Stint noel stint that sounds. 00:01:44 Speaker 1: Gross uh how you doing man i'm great i'm so used to reading ads these days that like i just panicked like i lost my place and then i was like oh yeah it's the actual podcast i can just ramble and stall as long as i need to yeah You remember this from being a kid? Was this in your wheelhouse, the Philadelphia Experiment? 00:02:04 Speaker 2: The movie was. 00:02:05 Speaker 1: Watched it last night. Sure. 00:02:07 Speaker 2: Oh, did you really? 00:02:08 Speaker 1: Yes. 00:02:08 Speaker 2: Wow. 00:02:09 Speaker 1: It is basically, I mean, the plot makes sense, but it's like a 15-minute plot. Yeah. They manage a lot of chasing in. 00:02:18 Speaker 2: To really draw it out. Yeah, they really gussied. Yeah, they drew it out. 00:02:22 Speaker 1: But the idea behind it, especially when, let's see, 1984, I was eight. 00:02:25 Speaker 2: Yeah. 00:02:27 Speaker 1: And this was about the time where I'm like, I'm going to Duke University to study parapsychology when I get older. 00:02:33 Speaker 2: When you were eight? Yeah. I didn't know what college was when I was eight. 00:02:36 Speaker 1: Definitely, that was in my wheelhouse. Really? Yeah. Wow. So …

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Books, tools, and gear mentioned in this episode

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Books

Close Encounters of the Third Kind
“Jacques Vallée, the astrophysicist who inspired the French scientist character in Close Encounters of the Third Kind”
Bookshop Amazon Audible trial
Philadelphia Experiment
“a 1979 book presenting the experiment as nonfiction was excerpted in newspapers nationwide”
Bookshop Amazon Audible trial