We had been told it was used to nab the Soviet sub, but when I tried to verify that story when writing the above post I only saw pics of the Glomar Explorer, and figured we had been told a tall tale.
Glad to see some deeper research proved out the original story - thanks!
The barge is now in Alameda: https://www.google.com/maps/place/Bay+Ship+%26+Yacht+Co.,+29...