Two US Navy witnesses at North-West Cape, Western Australia observed a black, spherical object hovering silently near the base, October 25, 1973.
THINK ABOUTIT UFO SIGHTINGS REPORT
The 1973 North-West Cape UFO: A Black Sphere Over a US Nuclear Alert
In the early evening of October 25, 1973 — the same day the United States raised its global nuclear forces to DEFCON 3 during the Yom Kippur War crisis — two US Navy personnel at the ultra-secret North-West Cape communications station in Western Australia independently watched a black, spherical object hover silently in the clear evening sky before accelerating away at what one witness called “unbelievable speed.” The base being used to relay that same real nuclear alert was, within hours, also the site of an unexplained aerial intrusion its own investigators never identified.
Date: October 25, 1973
Sighting Time: 7:20–7:30 p.m. (two sightings roughly ten minutes apart)
Day/Night: Early evening — sky described as clear and light at the time of both sightings
Location: US Naval Communication Station Harold E. Holt, North-West Cape, Western Australia, Australia
Urban or Rural: Remote/rural — an isolated peninsula military installation over 1,000 km from Western Australia’s major population centers
No. of Entity(‘s): None reported
Entity Type: None reported
Entity Description: Not applicable
Hynek Classification: DD (Daylight Disc) — corrected from the source material’s original CE-I. The primary witness placed the object roughly 8 kilometers from his position, far beyond the close-range (within 500 feet) threshold CE-I requires; a clear, light-sky sighting of a dark aerial object is better captured by DD despite the object’s spherical rather than disc shape
Duration: 20–25 seconds of stationary hovering observed by each witness before rapid departure
No. of Object(s): 1 object is assumed by the source record, though the two sightings — ten minutes apart, from different vantage points — were not confirmed to involve the same object rather than two similar ones; see Researcher’s Notes
Description of the Object(s): A large, black, airborne object, completely stationary apart from a halo around its
center that appeared to either revolve or pulsate; produced no apparent noise or exhaust while hovering, then accelerated away at extreme speed
Shape of Object(s): Black sphere
Size of Object(s): Approximately 10 meters in diameter (Fire Captain L’s estimate)
Color of Object(s): Black
Distance to Object(s): Two separate figures from two separate witnesses: Lieutenant Commander M (7:30 p.m.) placed the object approximately 8 kilometers to the west of his position on Murat Road, at an estimated altitude of 600 meters. Fire Captain L (7:20 p.m., roughly ten minutes earlier) gave no lateral distance but estimated the object’s altitude at approximately 300 meters, observed while driving toward the officers’ club at the base itself
Number of Witnesses: 2 — Lieutenant Commander M and Fire Captain L, both US Navy personnel, identified in official reports only by rank and surname initial
Special Features/Characteristics: The sighting occurred at North-West Cape, a highly sensitive US Naval communications and intelligence facility, on the same day the facility was being used to relay a real, historic US global nuclear alert (DEFCON 3) triggered by the Yom Kippur War crisis; two independent military witnesses of differing rank and role reported closely matching objects roughly ten minutes apart, from different locations relative to the base; American authorities investigated both sightings out of concern the object might be a new type of Soviet aircraft, given the base’s sensitivity, but reportedly reached no explanation
Case Status: Unexplained — investigated by US authorities at a highly sensitive military facility with strong institutional motivation to identify any genuine intrusion, particularly given the concurrent nuclear alert; no explanation was found
Source: Bill Chalker (1996), citing official US Navy reports; historical alert context per Richard Hall, “The Secret State”
Summary/Description: On October 25, 1973, during the same real global nuclear alert the base itself was helping to relay, two US Navy personnel at North-West Cape’s communications station independently observed a black, spherical object hovering silently in the clear evening sky before departing at extreme speed. American investigators, concerned about a possible Soviet aircraft given the base’s sensitivity, found no explanation.
Related Cases: None documented
Detailed Report
North-West Cape (US Naval Communication Station Harold E. Holt), Western Australia.
On a narrow peninsula more than a thousand kilometers north of Western Australia’s main population centers stands US Naval Communication Station Harold E. Holt — more widely known as North-West Cape. Its central structure, Tower Zero, rises 387 meters, surrounded by 12 further towers arranged in two concentric rings, supporting a Very Low Frequency antenna array spanning a thousand acres, the largest facility of its kind in the world. Spread across three sites over 60 kilometers, the base housed roughly 430 US military personnel during the Cold War and served as a critical communications link with US and Australian navy vessels, including nuclear submarines, across the Indian and western Pacific Oceans, as well as a Soviet signals interception post.
On October 11, 1973, five days after the outbreak of the Yom Kippur War in the Middle East, North-West Cape and other US bases in Australia were placed on full alert. According to author Richard Hall, this alert escalated dramatically due to a US National Security Agency misreading of an Arabic message from Syria to the USSR, which led senior US officials to believe Soviet troops might be deployed to the conflict. This situation climaxed in the early hours of October 25, 1973, Washington time, when a full nuclear alert — DEFCON 3 — was issued to US forces worldwide. North-West Cape was used to relay this alert to conventional and nuclear forces throughout the region. At the base itself, local time was early evening.
It was during this same evening that an unidentified object was spotted in the airspace over the base. At approximately 7:30 p.m., Lieutenant Commander M, driving from the communications station toward the support township of Exmouth along Murat Road, observed a large, black, airborne object roughly 8 kilometers to the west, at an estimated altitude of 600 meters. He reported that it hovered with no apparent sound or exhaust before, after roughly 20 to 25 seconds, accelerating away at what he described as unbelievable speed and disappearing to the north.
Approximately ten minutes earlier, at 7:20 p.m., US Navy Fire Captain L had separately observed what appeared to be a similar object while driving toward the base’s officers’ club. He initially mistook it for a small cloud formation, but stopped his car and watched for several minutes as it resolved into a black sphere, hovering in the clear, cloudless evening sky at an estimated altitude of 300 meters and roughly 10 meters in diameter. The object remained completely stationary apart from a halo around its center that appeared to either rotate or pulsate, before it too suddenly departed at tremendous speed and vanished within seconds.
American authorities investigated both sightings, driven by understandable concern that the object might represent a new type of Soviet aircraft given the base’s extraordinary sensitivity — but no explanation for its true nature was reportedly ever established.
Researcher’s Notes
The North-West Cape Sighting — 1973 and a UFO Over a Facility Relaying a Real Nuclear Alert
- The historical backdrop here is independently verifiable and genuinely extraordinary. The October 1973 DEFCON 3 alert was a real, well-documented moment of acute Cold War tension, triggered by a documented US intelligence misreading during the Yom Kippur War. That this sighting occurred at the exact facility being used to relay that alert, on the same evening, is a remarkable coincidence regardless of what the object actually was — and it explains why American investigators took the sighting seriously enough to actively investigate it as a possible Soviet incursion.
- This should be read as two separate sightings, not necessarily one confirmed object. Fire Captain L’s sighting at 7:20 p.m. and Lieutenant Commander M’s at 7:30 p.m. came from different vantage points — one near the base itself, one along Murat Road toward Exmouth — and neither witness account confirms they were describing the same object rather than two similar ones ten minutes apart. The original site record’s “No. of Object(s): 1” reflects an assumption of continuity between the two reports that the source material doesn’t actually establish.
- The CE-I classification didn’t match the primary witness’s own numbers. An 8-kilometer distance is nowhere near the roughly 500-foot proximity CE-I requires. This was a clear, well-observed daylight-adjacent sighting of a distant object, which DD captures far more accurately.
- Two witnesses of different rank and role, reporting independently, is a meaningful corroborating detail. A lieutenant commander and a fire captain are unlikely to have coordinated a story, and their descriptions — silent hovering, a pulsating or rotating central halo, sudden extreme acceleration — are consistent with each other despite being observed from different locations and, per official reports, without apparent prior collaboration.
- Official investigation driven by security concerns, not curiosity, adds weight to the “no explanation found” conclusion. The Americans investigated this because they were worried about a possible Soviet aircraft over one of their most sensitive facilities — a strong institutional incentive to find a mundane answer if one existed. That no explanation was reportedly reached suggests the investigation wasn’t cursory.
The North-West Cape sighting stands out among Australian UFO cases for its setting alone — a black, silently hovering sphere over one of the world’s most sensitive Cold War communications facilities, on the exact evening that facility was relaying a real nuclear alert to forces across the globe.
“After about 20-25 seconds the craft accelerated at unbelievable speed and disappeared to the north.”
— Lieutenant Commander M, October 25, 1973
