Seems to me that the Rig has been upgraded, it's a matter of equipment and total weight (deadweight it can carry on the platform). That's abt. what I know abt. it, but I'm sure Pup can answer this one easily enough. As per below OBO 1 depth:
"The Obo-1 well is located in 1,720 m of water (5, 640 ft) 190 mi (300 km) north of the city of Sao Tome and 125 mi (200 km) south of Port Harcourt, Nigeria. Chevron JDZ has a 51% equity share in the block while Esso Exploration and Production Nigeria-Sao Tome (One), and Dangote Energy Equity Resources have the remaining 40% and 9%, respectively."
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