All I know is that it was cancelled about the time the Airquakes stopped in Southern California.
I learned about Solid Metastable Helium from Robert L. Forward.
I deliberately visited him at a Science Fiction Convention in Anaheim California back in 1984 and we became friends.
He told me all kinds of classified stuff!
I did not know we had that kind of technology until he showed me it.
But you know I was at the right place at the right time and asked the right questions and I got some answers!
I was devastated when I found out he died.