Every unsolved case

Despite the largest search in park history, no trace of Dennis Martin has been found; officials believe he became lost in the wilderness.

Their intact boat was found, but neither body ever surfaced; drowning in a rapid is likely but unproven.

No physical trace was ever found and later sightings were never confirmed; the case remains open with Colorado investigators.

Two major searches and decades of leads have produced no trace of Trenny Gibson or an explanation for her disappearance.

A uniformed ranger vanished on duty; repeated searches found nothing, and the federal investigation remains open with a reward.

An 11-day search of a small area found no sign of Stacy Arras, and park files record no explanation.

She vanished within minutes on a familiar trail, and searchers found no trace or evidence of what happened.

His abandoned backpack was found off his planned route, but searchers never found Michael Ficery himself.

An intensive search found no trace of Sammy Boehlke; authorities believe he was lost in the park but have never located him.

A two-week, technology-heavy search found no trace of Sam Dubal, and his case remains open.

The manuscript is authentically early 15th century, but no proposed decipherment has been accepted by scholars.

Z408 and Z340 are solved, but Z13 and Z32 are too short to crack with confidence and remain open.

Many decryptions have been proposed, but none has won acceptance from Elgar scholars or cryptographers.

The Somerton Man may now have a name, but the five lines of letters in his Rubaiyat have never been deciphered.

The FBI's own codebreakers and a public appeal have failed to decipher the notes, and the death remains unsolved.

Multiple proposed decipherments exist, including a 2018 code-system theory, but none is generally accepted.

Several plausible readings exist, but eight letters cannot confirm any of them, and none is accepted.

No working decryption exists, and it is possible the author enciphered it incorrectly.

The plaintext exists in Sanborn's archive and a sealed verifier, but no one has publicly cracked K4's cipher or method.

No wreckage or distress call was ever found; structural failure or a storm is likely but unproven.

Despite major searches and an official inquiry, no trace of Waratah or her 211 people has ever been confirmed.

The ship was found, but its crew never was, and five federal investigations reached no official conclusion.

Disorientation and ditching are the likely explanation, but no wreckage was ever confirmed and the Navy lists the cause as unknown.

No wreckage was ever found, and the official British investigation concluded the cause could not be determined.

Debris and remains were recovered, but the main wreck has never been found and the cause was never determined.

A huge search found no wreckage of the 107-person charter, and investigators could not determine a cause.

Only scattered debris was found; the Coast Guard listed possible causes but could not determine how the ship sank.

Neither the Electra nor its crew has been found; a 2026 expedition is checking one lead, but nothing is confirmed.

Drifting debris proves the jet crashed at sea, but the main wreck and the reason it flew off course are still unknown.

The Amber Room certainly existed and was looted in 1941; no confirmed trace of the original panels has surfaced since 1945.

Six documented imperial eggs remain unaccounted for, and the 2014 rediscovery of the Third Imperial Egg proves such pieces can resurface.

The sword was real and documented in Tokugawa hands until December 1945; its whereabouts since then are unknown.

The 1865 robbery is documented and much of the money was never recovered, though it may simply have been spent long ago.

The theft is fully documented, no one was ever charged, and the regalia has never been recovered.

All 13 works remain missing more than three decades later, with no arrests and a $10 million reward still unclaimed.

Decades of instrument data confirm unusual lights, but neither exotic physics nor ordinary aircraft and cars have been shown to explain them all.

Ball lightning has now been recorded by instruments, but no explanation of what causes it is accepted by scientists.

Volcanic activity is the leading suspect, but NOAA lists Upsweep's origin as unresolved.

A few local hums have been traced to machinery, but no single source explains the Taos Hum or most reports.

The calls almost certainly come from a whale, but its species and identity remain unconfirmed and it has never been seen.

Some booms have known causes like shallow quakes or aircraft, but many skyquakes, including the Seneca Guns, remain unexplained.

The signal never repeated, and no natural, human or alien explanation has been confirmed.

Their age and Roman origin are secure, but no text, inscription or find context has revealed what the dodecahedra were used for.