One group consists of the actual supply vessels which have a deadweight of up to 1,000 tons, and which are mainly used for transporting drill strings, fuel and water.
Olunye uninzi lwabantu lwenziwa zezona ngqayi zokuhambisa ezinobunzima obufileyo obusuka kwiwaka leetoni ezisetyenziswa amaxesha amaninzi ekuhambiseni izixhobo zokuqhelanisa, ipetroli kunye namanzi.