As I stood on the balcony of my house, I heard the roar of military planes. I looked up at the sky, to see if I would see any plane. But I didn’t see anything because it was low cloud cover. After a few seconds of looking at the sky, I saw an object approaching me in the distance. I thought it was a smaller plane or a bigger bird? When the object was already close to me, I noticed that it was a black disk the size of a smaller car. He flew silently at an altitude of 200 to 250m. Its speed was somewhere between 300 and 400 km / h. He flew perfectly straight, without turning. I’m a planespotter and I know all kinds of planes, but it was a disk, a completely black disk. The object did not emit any sound or light. I only told my partner about what I saw, because I think others would make fun of me. I wish I had some shot or photo of the object that I saw but unfortunately I don't have.