A sky blue blast is coming out of it. When something is by the event horizon, it will get pulled in but also get pushed out, so it will remain static and implode, anything will get implode, it will implode until it will get extremely small. You would hear a low pitch sound, going high pitch til you can't hear it, when you are in the 50,000 metres or less near the Grey Hole, it's the blast is making that sound. There are bigger Grey Holes than Da69Q! Grey Holes are extremely rare.