The captain and two crew members of an overloaded Indonesian ferry that sank into the depths of a volcanic lake have been detained by police for questioning over the deadly disaster, authorities said. He was among just 18 people rescued after the vessel capsized and sank on Monday afternoon on Sumatra’s Lake Toba, a popular tourist destination. Official estimates list 192 people missing as of Thursday morning, raising fears that the incident could become one of Indonesia’s deadliest ferry disasters. The traditional wooden boat is believed to have been operating illegally with no manifest or passenger tickets.