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Case File 01 · Unsolved Cases

Mysteries Investigators Never Closed

Six cases in which detectives, coroners and code-breakers did their best and still left the folder open. For each one we separate the documented record from the theories that grew around it.

See the Timeline

A dense pine forest swallowed by thick grey fog at dawn

How to Read This File

Every case below closes with a short ledger. "Known" lists what can be shown from documents, physical evidence or peer-reviewed work. "Guessed" lists the leading theories, however popular. "Open" names the precise question no one has answered. This is the habit we try to keep across the archive: wonder is welcome, but it should never be allowed to pose as evidence.

The Man Who Jumped: D.B. Cooper

On 24 November 1971, a passenger on Northwest Orient Flight 305 from Portland to Seattle handed a flight attendant a note saying he had a bomb. In Seattle he exchanged the passengers for $200,000 and four parachutes, then ordered the plane south towards Mexico. Somewhere over southwest Washington, in darkness and rain, he lowered the rear airstair and jumped. The name he bought his ticket under was "Dan Cooper"; a reporting error made it "D.B." forever.

In 1980 an eight-year-old named Brian Ingram found $5,800 in decaying twenty-dollar bills on a sandbar of the Columbia River. The serial numbers matched the ransom. Nothing else has ever been confirmed, and the FBI suspended active investigation in 2016.

Known
The hijacking, the jump, the matching cash found at Tena Bar in 1980.
Guessed
That he died in the jump; dozens of named suspects, none proven.
Open
Who he was, and how part of the money reached the river.

The Body on Somerton Beach

On 1 December 1948, a well-dressed man was found dead against the sea wall at Somerton Park, Adelaide. He carried no identification, and the labels had been removed from his clothes. Months later, a tightly rolled scrap of paper was found in a hidden pocket, printed with the words "Tamám Shud", torn from a copy of the Rubáiyát of Omar Khayyám. The book itself turned up later, with a faint pencilled sequence of letters that many have read as a code.

For more than seventy years he was simply the Somerton Man. In 2022, researchers Derek Abbott and Colleen Fitzpatrick used genetic genealogy on hair from his plaster death mask and named him as Carl "Charles" Webb, an electrical engineer from Melbourne. A name, however, is not an explanation.

Known
The scene, the torn page, the 2022 genealogical identification.
Guessed
Poisoning, suicide, a romantic entanglement, espionage.
Open
How he died, and what the pencilled letters mean.

A name can close a missing-persons file and still leave the death certificate blank.

Archivist's note on the Somerton case

The Zodiac and the 340 Cipher

In the late 1960s a killer in Northern California sent letters and ciphers to newspapers, calling himself the Zodiac. One cipher was solved by a schoolteacher and his wife within days in 1969. Another, known as Z340, defeated professionals for fifty-one years until December 2020, when David Oranchak, Sam Blake and Jarl Van Eycke broke it using a combination of software and old-fashioned transposition work. The message was boastful and revealed no name.

Known
The confirmed attacks, the letters, the solved Z408 and Z340 ciphers.
Guessed
Many suspects, including some named publicly; none charged.
Open
The killer's identity and the remaining short ciphers.

Dyatlov Pass

In February 1959, nine experienced hikers led by Igor Dyatlov died on the slopes of Kholat Syakhl in the northern Ural Mountains. Their tent had been cut open from inside, and some bodies were found far below it, lightly dressed, with severe injuries. Soviet investigators wrote of "a compelling natural force". Theories multiplied: weapons tests, infrasound, hostile locals and worse.

In 2020 Russian prosecutors concluded an avalanche was responsible. In 2021, Johan Gaume and Alexander Puzrin published models in Communications Earth & Environment showing how a small, delayed slab avalanche could strike a tent cut into the slope and cause such injuries. Not everyone is persuaded, but this is now the best-supported account.

Known
The deaths, the slashed tent, the injury patterns, the modelling.
Guessed
Avalanche (leading), katabatic wind, military involvement.
Open
The exact sequence of the final hours.

The Flannan Isles Lighthouse

On 26 December 1900, the relief vessel Hesperus reached Eilean Mòr in the Outer Hebrides and found the lighthouse silent. Keepers James Ducat, Thomas Marshall and Donald MacArthur were gone. Superintendent Robert Muirhead found damage on the west landing and concluded that the men had probably been swept away by an unusually large wave. Later embellishments, including invented log entries, turned the story into a ghost tale.

Known
Three keepers missing; storm damage at the west landing.
Guessed
A freak wave; poems and films added the rest.
Open
Why all three left the station together.

The Mary Celeste

In December 1872 the crew of the Dei Gratia found the brigantine Mary Celeste drifting between the Azores and Portugal, seaworthy, with supplies aboard and her lifeboat missing. Captain Benjamin Briggs, his wife, their young daughter and seven crew were never seen again. Arthur Conan Doyle's 1884 short story added myths, such as warm tea on the table, that still circulate.

Known
The ship was sound; the yawl was gone; the cargo was alcohol.
Guessed
Fear of fumes or a leak led to a hasty abandonment.
Open
What happened to ten people in a small boat.

Timeline of the File

  1. The Mary Celeste is found drifting.
  2. The Flannan Isles keepers are found missing.
  3. The Somerton Man is found in Adelaide.
  4. The Dyatlov group dies in the Urals.
  5. D.B. Cooper jumps from Flight 305.
  6. The Z340 cipher is solved.
  7. The Somerton Man is identified as Carl Webb.