Isaac Koi Archive

Public research archive

isaackoi.com

Structured routes into cases, books, timelines, personalities, and reference material collected from the Isaac Koi archive.

A navigable UFO research archive

A large public archive of UFO cases, books, personalities, timelines, videos, and reference material. Search the publication catalogue for material inside 25,875 online PDFs, use site search for these curated pages, or start with the Starter Pack for an orientation.

CasesTimelinesBooksPersonalitiesVideosSource material

Search 25,875 publications Explore the research map Search site pages Start with the Starter Pack Browse best UFO cases Read the archive introduction

Explore the wider network

Isaac Koi UFO research sites

Visit focused UFO and UAP research sites that complement the main Isaac Koi archive.

Research collections 27

Personnel and cases

UFO Research Deaths

Practical guides on UFO Research Deaths, organized for fast browsing and comparison.

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Case libraries

UFO Crashes

Practical guides on UFO Crashes, organized for fast browsing and comparison.

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Phenomena

UFO Noises

Practical guides on UFO Noises, organized for fast browsing and comparison.

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Case libraries

UFO Identifications

Practical guides on UFO Identifications, organized for fast browsing and comparison.

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Cases

Cash Landrum

Practical guides on Cash Landrum, organized for fast browsing and comparison.

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Bibliography

UFO Fiction Exchange

Practical guides on UFO Fiction Exchange, organized for fast browsing and comparison.

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Regional dossiers

UFOs and UAP by Australian State

Australian UFO and UAP reports state by state — RAAF inquiries, National Archives files and archive gaps, from Canberra cases to airport sightings.

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Regional dossiers

UFOs and UAP by Italian Region

Italy's UFO record region by region — why Abruzzo became a hotspot, the 1978 wave, radar claims, navy searches and parliament's UFO policy files.

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Regional dossiers

UFOs and UAP by Canadian Province

Canadian UFO files province by province — the Duhamel file, ring formation traces, unresolved and duplicate records, and the 2020 sighting surge explained.

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Regional dossiers

UFOs and UAP by State

State-by-state guides to UFO and UAP reports, records, and explanations across the United States.

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Topic guides

Top 100 UFO Cases

Guides to the UFO cases most frequently discussed in a 963-book UFO and SETI sample.

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Topic guides

Celebrity UFO Files

Practical guides on Celebrity UFO Files, organized for fast browsing and comparison.

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Topic guides

Kecksburg

Practical guides on Kecksburg, organized for fast browsing and comparison.

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Topic guides

Magenta UFO

Practical guides on Magenta UFO, organized for fast browsing and comparison.

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Topic guides

Majestic 12

Practical guides on Majestic 12, organized for fast browsing and comparison.

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Topic guides

Nuclear UFO Files

Practical guides on Nuclear UFO Files, organized for fast browsing and comparison.

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Topic guides

Ramey Memo

Practical guides on Ramey Memo, organized for fast browsing and comparison.

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Topic guides

Rendlesham Forest

Practical guides on Rendlesham Forest, organized for fast browsing and comparison.

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Topic guides

Roswell

Practical guides on Roswell, organized for fast browsing and comparison.

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Search tools

Archive Search

Isaac Koi Archive Search shell for the public online archive search hosted at files.afu.se.

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Topic guides

UFO Archives

Practical guides on UFO Archives, organized for fast browsing and comparison.

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Regional dossiers

UFOs and UAP by French Departments

Department-by-department guides to UFO and UAP reports, records, and explanations across France.

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Regional dossiers

UFOs and UAP by German States

State-by-state guides to UFO and UAP reports, records, and explanations across Germany.

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Topic guides

UFO Hackers

Practical guides on UFO Hackers, organized for fast browsing and comparison.

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Topic guides

UFO Deadlines

Practical guides on UFO Deadlines, organized for fast browsing and comparison.

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Regional dossiers

UFOs and UAP by Spanish Provinces

Province-by-province guides to UFO and UAP reports, records, and explanations across Spain.

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Regional dossiers

UFOs and UAP by UK Counties

Historic-county guides to UFO and UAP reports, records, and explanations across the United Kingdom.

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Browse by branch

Choose a route through the archive

The archive is split into a practical UFO branch and a larger historical reference branch. Each one exposes its best entry points directly.

UFO 139 pages

The working branch of the archive: starter guides, curated cases, image-led pages, and video analyses.

Starter Pack Best UFO Cases UFO Videos

Subsection

Alien Photos

A gallery-heavy branch best approached by browsing or direct search.

Subsection

Best UFO Cases

A curated route into the strongest or most discussed UFO cases in the archive.

Subsection

Free UFO Researcher Starter Pack

Orientation material for new readers and a sensible first stop before the larger archive.

Subsection

UFO Videos

An image-led branch for clip-by-clip analysis and video case notes.

UFO History 2047 pages

The long-form historical reference branch: timelines, personalities, books, and the development of UFO culture and research over time.

UFO Timeline UFO Books UFO Personalities

Subsection

UFO Books

A deep book-reference branch with sortable tables and linked author pages.

Subsection

UFO Personalities

A people-focused branch for context on recurring names in the archive.

Subsection

UFO Timeline

The main timeline branch for case-by-case historical browsing.

Recently updated

Recent highlights

A smaller, more varied sample of visible additions and updates across the archive.

Recent highlight

1948.0107 Captain Mantell incident

UFO Timeline27 Nov 2025

Captain Mantell incident "Impact" Rating = 14 "Credibility" Rating = 13 "Expert" Rating = 8 "Strangeness" Rating = 4 On 7 January 1948 , Captain Thomas F Mantell Jr (Air National Guard F-51 Mustang fighter pilot) dies d...

Recently updated

Koi UFO Video 138

UFO Videos15 Jun 2017

Koi UFO Video 138 : UFO near Warminster 2017 (AeroSparx pyrotechnics) https://www.youtube.com/watch?v=T0Cl6lKJXgw [DEBUNKED] Koi UFO Video...

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2. Preliminary points

Free UFO Researcher Starter Pack26 Jan 2017

Section 2: A few preliminary points There are three preliminary matters that I’d like to mention briefly. These are: Section 2.1 - The Goog...

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Introduction to isaackoi.com

Archive introduction26 Jan 2017

I am a barrister in England with an interest in various issues relating to "UFOs". I write under a pseudonym because some clients and colle...

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Tsiolkovskii, Konstantin Eduardovich

UFO Personalities28 Sep 2015

Konstantin Eduardovich Tsiolkovskii Brief comments to be added on this individual.

Recently updated

Denzler, Brenda “The Lure of the Edge”

UFO Books28 Sep 2015

Brief review to be added of Brenda Denzler 's book “ The Lure of the Edge ” ( 2001 ) (available on Amazon USA and on Amazon UK )

Recently updated

Koi Alien Photo 11

Alien Photos10 Mar 2015

Koi Alien Photo 11 Koi Alien Photo 11_d appears to show an alien being wearing some sort of uniform with a high collar. Various very simila...

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22: Quantitative criteria : BUFORA’s case priority

Best UFO Cases1 Oct 2014

“ Best UFO Cases ” by Isaac Koi PART 22: Quantitative criteria : BUFORA’s case priority One of Britain’s most profilic and respected ufolog...

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Koi UFO Video 134

UFO Videos15 Jun 2017

Koi UFO Video 134 : UFO over Rollercoaster (Section 51) https://www.youtube.com/watch? v=rirmpCVKre4 [DEBUNKED] Koi UFO Video 134 appears t...

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Koi UFO Video 075

UFO Videos9 Mar 2017

Koi UFO Video 075: Los Rosques UFOs (Manbird12000 - Damien White) https://www.youtube.com/watch?v=u81Nk1gN8ao [DEBUNKED] Koi UFO Video 075...

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Koi UFO Video 133

UFO Videos27 Sep 2016

Koi UFO Video 133 : Large UFO over Iraq (Section 51) https://www.youtube.com/watch?v=NonX8LW_SPk [DEBUNKED] Koi UFO Video 133 appears to sh...

Recently updated

Koi UFO Video 132

UFO Videos13 Sep 2016

Koi UFO Video 132 : Huge UFOs overs over Dresden (Section 51) https://www.youtube.com/watch?v=H8GSn2m6ieQ [DEBUNKED] Koi UFO Video 132 appe...