The bottom appeared to be of a greyish metal. Object hovers 4. Jets shut off. Object tilts slightly. Jets shut off.
Object rises vertically, still tilted slightly.
The only thing I can think of to describe it is aluminum foil. Opaque helmets rose from their shoulders. I could not see their faces. A faint hum was heard during hovering. As it took off, it emitted a soft but high pitched sound.