Stationary over our swimming pool

I was cleaning pool with metal pole and attached brush, this requires to reach up and push downwards, as I reached up saw a craft less than 1,000 ft with circular lights. Within seconds it descended and was entering our air space into back yard and over pool. At that moment ran to rear door screamed at family to come out, wife did, we stood along pool deck with craft no further than 20 feet from us. it floated over pool at 30 feet altitude. My wife kept repeating oh my god with no religious meaning but of disbelief. It angled forward at 45 dregrees and we could see interior but no occupants. As it angled i noticed that pool lights were not lighting upper read section but that light seemed to come through it's skin. bottom was concave circular with 2 rectangular devices side by side in center of concave