This week Esgian’s Week 50 Rig Analytics Market Roundup notes developments in the semisub sector including that Shell has decided to exercise its option on Stena Don in the North Sea but not on Deepsea Bollsta in Namibia. Meanwhile, a new contract for the Transocean Barents will see it operate in the Black Sea, and jackup Shelf Drilling Perseverance will move to Vietnam.