The giant aquatic beings were first encountered by military divers at a depth of about 50 meters in Siberian waters. Russian submarines also reported several close encounters with mysterious unidentified submersible objects (USOs).
The Soviets, and later the Russian authorities, moved quickly to suppress public awareness of the strange sightings by discrediting and ridiculing independent witnesses, researchers, and journalists who went public with testimonies about the strange beings in Siberian waters.
Stonehill and Mantle cited several examples of encounters with the alien beings and their USO crafts in northern waters.
In 1982, two military officers, Mark Shteynberg and Lt. Colonel Gennady Zverev, supervising training of Russian reconnaissance divers ("frogmen") of the Turkestan and Central Asian military regions at Issik Kul Lake in the Transiliysk Ala Tau area, were visited by Major-General V. Demyanko, the commander of the Soviet Military Service of the Engineer Forces of the Ministry of Defense, who warned them to look out for mysterious underwater humanoid creatures, according to Pravda.
He told the officers that warning became necessary after divers performing similar training exercises in the Trans-Baikal and West Siberian military regions had shocking encounters with strange creatures at a depth of about 50 meters.
The creatures, according to the Russian general, were dressed in silvery bodysuits, with strange-looking sphere-shaped helmets over their heads, but no scuba diving equipment.
The encounter caused the military authorities alarm, and the Russian navy sent seven divers and one officer to capture the creatures. But after the men found one of the creatures and attempted to capture it in a net, they were flung out of deep waters to the surface by a mysterious force.
The rapid, forced ejection from a depth of about 50 meters did not allow the men to go through normal decompression process. Consequently, the men suffered severe effects of aeroembolism (Caisson's disease), also known as decompression sickness or "bends."
The condition is caused by the formation of nitrogen bubbles in the blood vessels due to rapid lowering of pressure. Three of the divers died and others suffered serious permanent disabilities as a result.
Researchers claim that although the incident was the first widely reported encounter with the strange beings, an obscure report from the early 1900s claims that a group of teenage boys diving in a lake had found three-meter humanoid skeletons in a cave inside a mountain in Georgia.
There have also been reports of sightings of anomalous phenomena associated with deep-water lakes in Russia since early in the 20th century. The reports include claimed sightings of giant flying saucers and sphere UFOs taking off and landing.
The navy documents also reported spectacular UFO sightings by Russian personnel sailing in international waters outside the East Siberian Sea.
A mysterious case involved a massive bright sphere UFO, about 60 meters in diameter, spotted in August 1965 by the crew of the steamship Raduga. The UFO was spotted emerging from the waters of the Red Sea and hovering at a height of about 150 meters for several minutes before diving back underwater.
Admiral Domislovsky, the head of the intelligence department of Russia's Pacific fleet, also reported a similar object that hovered about 900 meters above Pacific waters while dropping smaller objects or pods into the water.
The mysterious UFO returned later and the pods re-emerged from the water and returned to the UFO which then flew away.
Probably the most spectacular reported sighting in international waters occurred in June 1984, when the crew of Gori sailing in the Mediterranean, about 20 miles from the Strait of Gibraltar, reported sighting a massive flying saucer UFO over the sea.
The flying saucer, with a diameter of about 20 meters, had a metallic gray color. It flew over the ship and ascended at great speed into the clouds and disappeared.
Paul Stonehill gave a graphic description of the sighting.
"They were at the left bridge extension wing when [they] observed a strange polychromatic object," he wrote. "When the object was astern, it stopped suddenly. S. Bolotov was agog, shaking his binoculars and shouting 'It is a flying saucer, a real saucer, my God, hurry, hurry, look!'"
"Suddenly the UFO jumped up several times, as if moved by an invisible wave. The crew of Gori tried to attract the object's attention using a signal projector."
"Globa looked through his own binoculars and saw, at a distance over the stern, a flattened out looking object... gleaming with a grayish metallic shine... [and] diameter no more than twenty meters," he continued. "Around the lower portion of it Globa also observed 'waves' of protuberances on the outside plating. The base of the object's body consisted of two semi-discs, the smaller being on top; they slowly revolved in opposing directions."
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