Beautiful translucent-white jellyfish-like pattern with lights all over it traveling north to south along the shore at Vero Beach, FL

Saturday evening, two friends and I were sitting on the beach in Vero Beach, FL. As it grew dark, there was just enough light to see the white foam of the waves crashing on the shore.
 Suddenly, we all saw a very large translucent-white jellyfish-type object, flying north to south parallel to and close to the shore horizontally at an even speed, very low over the water. The “tentacles” of the “jellyfish” streaming behind it were uniform and looked as if they were made of lights. It cruised in front of us, clearly on a course, until it disappeared farther down the beach where the lights were a little brighter.
 My impression is that it was like a stenciled white pattern moving through the air. We are not sure if it was ship or an organized intelligence. It was otherworldly and seemed to have a non-physical presence. We estimate it was traveling at about 30 mph, but we have difficulty nailing down dimensions or exactly how close it was to the shore and how high about the ocean it was. Maybe 50' long and 20' high? Maybe 20' from the shore and 20' above the water? Impossible to say.
 But it was breathtaking and marvelous.