A Russian navy officer says rescuers are hours away from reaching seven Russian sailors trapped aboard a small submarine on the Pacific Ocean floor with a dwindling air supply. But Rear Admiral Vladimir Pepelyayev says there is enough air on the sub to perhaps last through Sunday. He says the crew is in "satisfactory condition." U.S. and British undersea rescue vessels are on ships heading toward the submarine, which is stranded off the Kamchatka Peninsula in Russia's far east. Russia's navy says Russian rescue crews have looped cables around the sub in hopes of lifting it toward the ocean surface. But it is not clear if rescuers have succeeded in raising the vessel. The submarine is stuck nearly 200 meters below the surface, its equipment tangled with an antenna from a military monitoring system. The incident comes nearly five years after a Russian nuclear submarine (the Kursk) sank in the Barents Sea following an explosion. All 118 men on board died.