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Alaskan Air Command
APO 942 c/o Postmaster
by KJ NARA Date 01/09/09
22 April 1948
Subject: Unusual Sightings along Aleutian chain
TO : Director of Intelligence
United States Air Forces
National Defense Building
Washington 25, D. C.
1. Beginning 8 March 1948 numerous sightings have been
made in waters surrounding the Aleutian Islands by aircraft
of this command. The following report is a summary of all
the unusual sightings made to this date.
1st sighting - 8 March 1948
during a routine flight from Davis Air Force Base to Shemya Air Force Base at 090050Z, the pilots of
aircraft AF5889 observed a black superstructure protruding the surface of the ocean at 177° 40' E; 51°
57'N. The pilots recognize the object as a submarine and immediately headed in its direction at
an altitude of 500 feet above sea level. When approximately 8 miles from the cited object and after
five minutes of continuous observation, the object submerged on 120° heading, creating a large area of
foam and leaving a wake which appeared to be three times the length of the cited object. A thorough
visual search was made in the area where the object submerged with negative results. It was reported
simultaneously when he was attempting to make voice contact with Shemya radio on 4220 kcs.
The weather at the time of the observation was as follows: visual contact condition 20 miles visibility,
choppy sea with occasional whitecaps, surface winds 12 to 15 knots
BASIC : Ltr to Dir of Intelligence, USAF, Unusual Sightings
along Aleutian Chain, 22 April 48.
2nd Sighting - 10 March 1948
While on a local flight from Davis Air Force Base at 1945Z, the pilots of aircraft AF 6368
observed a blue-white flare ascend from the south tip of Tanaga Peninsula (177° 55'W; 51° 35'N) to
a height of 7000 feet, dropping off sharply and falling to the ground in a deep orange color. The
observation was made 18 miles away at 7000 feet. The duration of the observed light was approximately
3rd Sighting - 10 March 1948
While on a routine flight to Cape Air Force Base, Umnak Island, Alaska, the pilots of aircraft AF 2537
observed from 5 miles distance and 3000 feet a white vessel at 167° 50'W, 53° 27'N proceeding outbound
from the shore of Umnak Island on a course of 30°. No curiosity arose upon the sighting of the vessel,
except that it appeared to be proceeding exceptionally fast with a long narrow wake trailing behind.
(Interest was taken on the above report for the following reason: the shape of the vessel as described by
the pilot was identical to the description as submitted by the pilots of #1 sighting, who sighted an object
which resembled a submarine.)
Whether at the time of observation was ceiling and visibility unlimited.
4th Sighting - 13 March 1948
While on a routine cargo flight, the pilots of an aircraft of this command sighted from 8000 feet and between
breaks in a broken cloud layer, two black objects on the surface of the water (55° 58' N; 160° 50'W and 55° 56'
N; 160° 54'W) which to them appeared to have the shape of a submarine conning tower.
5th Sighting - 2 April 1948
Surface radar contact was made by a Navy patrol aircraft operating from Kodiak, Alaska while at 1000 feet
altitude, in position 53° 03'N; 170° 351'W at 0115Z.
BASIC: Ltr to Dir of intelligence, USAF, unusual sightings along the Aleutian chain, 22nd April 48.
Target was under observation while aircraft proceeded from 19 miles to 4 miles of target where it
disappeared from scope. A thorough visual and radar search was made with negative results.
The weather at the time of the observation was: visibility 15 miles, southeast wind at 18 mph.
6th Sighting - 3 April 1948
The commanding officer of Naval vessel ATA192 reported a surface radar contact at 0305Z while in
position 53° 05'N; 171° 10'W. True bearing of target was 330° at 13 miles distance. Target bearing
remained constant for 25 minutes in the distance decreased to 11 miles, then disappearing from scope
at 0330 Z.
The weather at the time of observation was: visibility 5 to 8 miles, 10 foot seas.
7th Sighting - 7 April 1948
On a scheduled flight from Fort Glenn to Adak, Alaska, the pilots sighted from 5000 feet at 072254Z an
unidentified surface object in the vicinity of the Koniuji Islands. (52° 14'N; 175° 05'W). Object
appeared to be a small vessel proceeding on a heading of 120°. Upon closer inspection, object
appeared to be submerging and trailing a narrow wake.
8th Sighting - 10 April 1948
Ground Control Approach radar operator at Shemya Air Force Base, Shemya, Alaska made a positive radar
contact from 0750Z to 0812Z and 0907Z to 0920Z. The range and azimith of the target was 8 1/2 miles
at 172°. The known altitude coverage of radar at above range was 1000 to 4000 feet and the
bearing was 95° magnetic. The approximate speed of the target was 14 to 16 knots.
The weather at the time of the observation was: Ground fog.
2. The following operational action was taken as a result of the above sightings.
BASIC: Ltr to Dir of Intelligence, USAF, unusual sightings along Aleutian Chain, 22 April 48.
Three Navy privateers dispatched from Adak, Alaska to search area at dawn on 9 March 1948.
Navy reconnaissance conducted on 16 March 1948. Results indicated one large grayish-brown building
55° 56'N; 161° 19'W. Building had two adjacent derreck-like structures about 50 feet high.
Pilot who made No, 4 sighting made reconnaissance of area in which he sighted objects on 19 March 1948
area which the pilots searched and reported seeing objects did not correspond with the area the Navy
reported were not there when he conducted search on 19 March 1948.
1st, 2nd, 3rd, 4th Sightings
Field orders were issued to the's 72nd Photo Reconnaissance Squadron (VLR) and long-range reconnaissance
was conducted on 17 March 1948, with the following results: No positive targets sighted. Visual search
made in the area No. 1 and No. 4 sightings. Radar search in area of No. 3 sighting. No. 1 sighting
area not completely covered due to lack of fuel and strong winds aloft. Three partially sunk Japanese
vessels sighted in Kiska Harbor and one in Gertrude Cove, Kiska Island.
Reconnaissance scheduled for 18 March 1948 was canceled due to deep snow on the Ladd Field runways.
Visual and radar search made immediately by same aircraft which made sighting.
5h and 6th Sightings
Detailed reconnaissance conducted by Navy Privateer from NOB Kodiak on for April 1948 between 169° W.-
174° W. Aircraft
BASIC: Ltr to Dir of Intelligence, USAF, unusual sightings along Aleutian Chain 22 April 1948.
Equipped with Sono Bouys.
Navy PB4Y aircraft proceeding on the same course as reporting aircraft, and twelve minutes flight time to the
East, intercepted message and requested reporting aircraft to indicate last observed position of surface
craft. Navy PB4Y prepared Sono Buoy pattern and detected sounds similar to that made by undersea's craft.
Two or three whales were observed surfacing and submerging within the Sono Buoy pattered. Listening device
operator was able to differentiate between sounds attributed to the whales and that of the machinery-like
turn. PB4Y remained in general vicinity for approximately one hour.
No action taken.
3. In order that object sighted as those described above can be more positively identified, it is now a
standard operating procedure with all scheduled aircraft flying the Aleutian Chain to carry one pair of
binoculars and one loaded K-20 camera. Instructions have been given to aircrews to utilize the binoculars
for search and to get photos of all unidentified objects sighted with the K-20 camera.
Lt. Colonel, USAF
Director of Intelligence