What does self-operated mean?:
The Bluewhale 1 is a Frigstad D-90 design semi-sub:
It is a further development from the original T-60 (Tender) and P-60 (FPSO) from the 1990, none of which was ever built, but the Production Unit shown in this article looks “suspiciously” similar to the P-60 design from the:
PS> I helped draw up the concept design in one long overnight session, when we got a question from a potential client whether it was possible to use the T-60 as a Floating Production Unit (FPU), but with storage capacity: