FWIW, the Glomar Explorer was sold for a pretty good chunk of change ~ 2013/14 IIRC and then shipped of to China for scrap in 2015 (which I thought odd).
It, or a similar constructed ship, could service a long endurance non nuclear sub without its (the sub) needing to surface.
Well that makes sense if the Deep State wants to stay deep enough to avoid detection, subs being so hard to hide from satellites ‘n all.