Aircraft flying very low to ground, no sound emitted, size of a large plane but looked like a massive drone

I was driving down Red Rover Road and spotted an aircraft flying really close to ground and descending into the hill. It was as large as a plane but was in the shape of a drone. Lights dotted along the craft. No sound emitted from the aircraft. It definitely wasn’t a helicopter or plane and even if it was, it wouldn’t be able to land in this location because the hill is quite steep. There is a decent size water quarry behind the hill, followed by some land and then a river. This is a secluded area and the town power station is located nearby as well as a power sub station.