Have humans brushed past underwater civilizations? The mysterious glimmers of the deep sea, the elusive glowing entities, and the aquatic creatures from ancient legends all point to a possible answer. From the astonishing discoveries made by the Danish research vessel Galathea in 1949, to the phenomena of light wheels and light bands in the 1970s, and even to modern UFO sightings, the unknown world of the deep sea has always captivated human curiosity. These phenomena not only challenge scientific understanding but also spark endless imagination about the existence of underwater civilizations.