Countr7; Japan/USSR Subject: L1~inous Sigbtings off the Hokkaido Coast Source: Maritime Safety Board Preparing Officero Anthony M., Pereira, Caot. USAF Set 1/1, Card 1/3 UN CLASS IFISD HC #; Nons Agency: 6004th Air Intal Info Soec: DE/nd Distr:. ~4F3-3 cys/4Bla Entire Document 1. The information contained in this report \Jas obtained from Mr., Noboru ITO, Chief of the Aviation Administration Section and . Toru SAHARA, Chief of the No. 2 Security Section, MARITIME SAFETY BOARD, as reported to them by J~canesa fishermen off the HOKKAIDO Coast. 2.. This report contains information on three luminous sighti ngs cf "n~<no\Jn origin .. LUMINOUS SIGHTI.IGS OFF THS HOKKAIDO CO/\ST 1 . On 8 March 1958 personnel of t he Air Technical Intelligence ~ection, Set 1/1, Card 2/J Japan/USSR MC #:. None 6004th AISS, visited Noboru ITO, Chief of t h e Aviation Administration !:ecticn ~=d Tor u SAHARA, Chief of the No. 2 Security Section, MARITD!E SAFSTY BOA.liD O~A) f or information on an alleged explosion off the SIBERIAN coast on J 9 Fsbruary 1958. 2. Recently t~ree unknown luminous sig.tings wer e ma de off i.he <oast of P.O IDO by fiste~en and reported to ~3A. }~A has recorded those ci da~::.s but will not investigate the matter fcrt!"er. I n eacr ir.stance t"'."' 3~ghting waamada at night. There is no report indicating an explosion off ~he coast of SIBERIA an 19 ~ebrua~ 1958 . J . At 1 830 hours (JST) on 31 Octcber 19)7 fister~en observed , r3llar o f f1a:ne 100m hig!'l, 1500 m "West of E}ICE?StJ (L.4l.JN/14J1,.2E) for e.pp:-cx ~ ... &ly ~5 mi The color changed from red to bl~e t~en disappe~red. ~-7~ At 2034 hours (JST) on 1 Narch 1958 fisl':en:en observed a lc:i::ous =ody that disappeared after 10 minutes at an altitude of approxirr~tely 2 ,000 m ~n the dirsction of NarSD'3TO POI:~4JJ,.i,.N/145253:) on !C'v");~Si::IP.I I SLA;;n. "'l;e :olor "Was not determined. At 2103 hours ( JST) C'1 the sar:e day, a h:::.ir.c . ~ccy was observed rising gradually for about 20 ~inutes then disappear nea r :.:APADNA7A (mlNERUSU) (L.3L.5~/14526E). Tl:e color was not c~r:.ainly ide!:.ti.:'ied, -~u was not red or green Set 1/1, Card 3/3 Japan/USSR COMMENTS OF THE PREPARING OFFICER: 5. At approximately 0959 hours (JST) on 19 February 1958 an unknown phenomena~believed to have been an explosion, was detected at 4430N/13730E a t a OS radar site in JAPAN. The phe nomena lasted approximately two tours. This office checked with the 1-!eteorological Agency for barorr.etric or seismic data on the premise that an explosion was detonated. It was learned teat t here ware no barometric or seismic changes indicative of an explosion at the above time. Negative infor~tion was also obtained from tbe }~riti=e and Air Staff Offices of the Defense Agency. 6 . Officials of the Heteorological Agency stated that any baro:T.etric change would be detected at weather stations i~ JAPAN. The seismic de~ection~ of a nuclear exolosion at the HATSUSHIP.O SEISl".uLOGICAL OBSERVATORY is believed ~ o ba7e been in~tigat~d froo this search. (P~fer to 6004tb AISS, I?. 1885-58 ~or seismic detection of USSR nuclear explosion. )