Shag Harbour — Transmedium Entry, Atlantic Canada

On October 4, 1967, multiple witnesses on the shore of Shag Harbour, Nova Scotia, observed four amber lights in a horizontal formation flying low before one object tilted at approximately 45 degrees and entered the ocean with a bright flash. Two RCMP officers separately confirmed the sighting. Witnesses reported seeing a yellowish foam on the water where the object entered. Canadian Coast Guard and RCMP vessels responded immediately; divers subsequently searched the area without finding any aircraft wreckage, fuel slick, or debris. The Royal Canadian Air Force and Royal Canadian Navy conducted an investigation. A declassified Canadian government file lists the Shag Harbour incident as officially 'unidentified' — one of only a handful of such government designations in the global record. A formerly classified document later obtained by Canadian researcher Chris Styles revealed that the object was tracked moving underwater by both Canadian and U.S. Navy assets (via U.S. SOSUS hydrophone arrays) to a point approximately 25 miles from Shag Harbour near Shelburne, Nova Scotia, where a Canadian naval facility was located, before the object accelerated and departed the area underwater. The 2026 archive release includes U.S. Navy SOSUS tracking data and a previously classified joint U.S.–Canada incident report.