"The CIA used a futuristic new tool called “Ghost Murmur” to find and rescue the second American airman who was shot down in southern Iran, The Post has learned. The secret technology uses long-range quantum magnetometry to find the electromagnetic signal of a human heartbeat"
Note, I agree that it was probably some novel beacon technology. Just answering your question about why people are debating whether it was a device that could detect a human heartbeat from long range.
Not that I believe any of those words are true beyond the code name. The incident is exactly the kind of thing you'd want to create false rumors about
https://www.seattletimes.com/nation-world/nation-politics/in...