The world's largest offshore oil rig has stopped sinking three days after massive blasts rocked the structure, killing 10, its Brazilian owners said on Sunday, raising hopes the $350 million rig can be salvaged. The steeply listing 40-story platform was stable on Sunday after sinking more than 13 feet (four metres) since explosions ripped through a column and threatened to send the rig to the bottom of the ocean, Brazil's state oil giant Petrobras said.