witnessed a disk shaped craft approximately two hundred feet of the ground

In the early nineteen seventies on a summer afternoon over the city of Vancouver British Columbia I witnessed a massive disk shaped craft red in color with a dome and four distinct colored lights on its undercarriage. Rotating slowly in a clockwise direction it slowly rose to a hovering position about two hundred feet off the ground, it began rotating faster and faster and began emitting a fiery orange glow from the undercarriage, suddenly it shot straight upwards almost out of sight and returned to an unknown height in the sky.
Sitting motionless for a few seconds it suddenly manoeuvred in zig zag motions and made instant right and left turns at rapid velocities, it streaked back and forth across the sky then it rapidly disappeared into the north east mountainous region. Until this event I was skeptical about this controversy but now I can say without question such a technology exists somewhere.
Witness indicates that date of incident is approximate.  PD