it moved fast and changed direction very quickly without a soundwas like a light triangle that moved very fast and very close to earth, like 150 meters. i saw it first and told the others, couse it didn't make any sound. we were on a diserted beach and there was no plane area for more than 200 km. was like it absorbed light, couse it didn't reflect any. we laughed a lot after, because we were reallyscared, allthough we didn't admit it.