Mother Craft that released 3 Smaller Craft - Witness of the Craft leaving the atmosphere

In 1983 I and two friends winessed a very large flying craft, hovering very high in the sky just slightly north from above our family's 200 acre property at Dunmore, NSW, Australia. It was between 8 - 10pm on a clear, cloudless night. My friends and I were on the hill in the centre of our property in a car, from which we did not alight.
One friend first noticed the craft, which was the very similar in shape to a 'diamond' shaped craft. I liken it to a "brilliant cut diamond" which had the point removed from the base. The top section of the 'diamond', which was divided by lights, was about 1 third of the size of the bottom section. The was no noise emitting from the craft. I do not recall the colours, but I recall that the lights around the girth of the craft were a different colour to the rest of it.
We watched it hovering for about 2 minutes and all of a sudden it excellerated towards us at a great speed and stopped suddenly. I could not tell the distance it travelled but it appeared to 'grow' from about the size of a full moon to something 5 times the size, in a true 'blink' of the eye. It had travelled directly towards us. We were more amazed than scared. It hovered above us, still slightly to the north and then released from the bottom section (not at the exact base) 3 smaller craft which I liken to Fire Flys due to the way in which they darted in all directions, at great speed. They were the shape of glowing balls. Two were the same colour and one was different, yet I can only recall that one of the colours of the craft were red. I don't recall if the red were the majority of the craft or not. These craft flitted all over the night sky while the 'mother craft' remained hovering near us. This scene continued for such a length of time that one of my friends got bored watching.
We then lost sight of the smaller craft and next thing, the mother craft took off in the exact opposite direction it had come at us, at great speed again. It moved a greater distance away than we had seen it the first time, and at such speed that it went from this HUGE thing in the sky to only a point of light, the size of a star. If you had not seen it leave, you could not have distinguished it from the other stars in the sky.
My thoughts returned to the 3 craft which had been left behind and were now nowhere to be seen. A few/one (unable to recall exactly) minute later a commercial plane flew across the night sky, with it's stationary lights flashing in the sky. The Fire Fly craft came back into view, as if following at a distance, yet taunting or showing off to the plane's lack of ability. They remained a good distance behind the plane, darting around as if to show off their abilities to us (we were very visible as we watched them on the top of the hill). The plane's appearance is what we used to discuss how big the Fire Fly craft were in comparison to the plane and their ability to turn at great speed in any required direction. It also confirmed that they were not the tail lights of a commercial plane. The mother craft still remained stationary in the outer atmosphere whilst this occurred, still appearing as a star.
About five minutes after the plane had flown from view the mother craft returned, again at such speed that it just appeared to 'grow' again in size. It did not return as close as the last time nor as far as the first time sighted. It collected the Fire Fly craft very quickly and then took off, at great speed, in the opposite direction again. This time it did not halt in the outer atmosphere but continued on at enormous speed so that the 'star' that it turned into appeared to go out like a light bulb that had just blown. It was a like a tiny little flash or blink and then the 'star' (craft) was gone.
When I arrived at our farmhouse I excitedly told my mother about what we had seen and she commented that the television screen had gone 'snowy' for almost half an hour.
I have not witnessed another UFO sighting since.
Date is approximate.  PD