(1) What relationship does PetroSA have with the diving support vessel Iremis da Vinci; (2) (a) which companies is PetroSA currently using to supply divers at the Ikhwezi gas fields and (b) at what cost are these companies supplying their services; (3) (a) which companies providing services to PetroSA at Ikhwezi gas fields have been paid upfront for their services and (b) why was each of these companies paid upfront?