Nyos: the night a lake released gas
Sudden deaths of people and animals were investigated through water, gas and terrain measurements.
An explanation existsNorthwest Region
Atlas of mysteries
Items: 143All material
Lake Monoun: an invisible gas wave
A crater-lake gas release killed 37 people and helped reveal the hazard of carbon dioxide accumulated in deep water.
An explanation existsLake Monoun, West Region
Hessdalen: lights under instrumental observation
A winter campaign attempted to turn reports of lights into testable measurements.
Insufficient evidenceHessdalen valley, Trøndelag
Trans-en-Provence: a landing account and a ground trace
A single-witness 1981 account investigated by the gendarmerie, GEPAN and laboratories.
Insufficient evidenceVar, near Trans-en-Provence
Rendlesham Forest, 1980: lights, a memorandum and later accounts
Servicemen reported lights in the forest; surviving records distinguish the early account from later additions.
Insufficient evidenceRendlesham Forest and RAF Woodbridge area, Suffolk
Kaikōura: film, lights and radar returns
A sequence of observations became famous through footage filmed aboard a freight aircraft.
Insufficient evidenceEast coast of the South Island
The Wow! signal: one record and an open question
On 15 August 1977 a radio telescope recorded an unusual narrowband signal whose source remains unidentified.
Insufficient evidenceFormer Big Ear radio telescope area, Ohio
Enfield: knocks, jumps and another voice
Investigators recorded knocks and a harsh voice in the Hodgson home; their observations coexisted with detected tricks and disputed evidence.
Under reviewEnfield district, north London
The Zuiyo Maru carcass
A decomposed carcass suggested a possible plesiosaur; preserved fibers instead supported a basking shark or close relative.
An explanation existsSea east of South Island
Megamouth: the shark in a sea anchor
A large shark unfamiliar to science appeared when marine equipment was recovered.
An explanation existsHawaii, waters off Oahu