The Indian Coast Guard has launched a rescue operation for six crew members aboard the stranded bulk carrier Sigma Pearl near the Ravva oilfield off Andhra Pradesh's Kakinada coast. The Marshall Islands-flagged vessel reportedly suffered engine failure amid the impact of Cyclone Arnab. Visakhapatnam: The Indian Coast Guard launched an operation on Thursday to rescue the crew of a Singapore-bound bulk carrier stranded near the Ravva oilfield off the Kakinada coast in.