[Bubba_Leroy]

No rotors. One even hovered over the helipad on the USS Peralta and was observed by many sailors.

The "pyramid shaped" drones at the beginning of the video looked just like this BAE Systems Taranis Unmanned Combat Aerial Vehicle.

[algore]

Those things are super scary, especially the small scale ones that fly backwards cause they look like daemons from hell as they chase you