Photo taken on June 27, 2018 shows people taking part in a search operation for an object suspected as the wreckage of a boat which capsized in Lake Toba last week, in North Sumatra, Indonesia. The Sinar Bangun boat sank on June 18 after leaving Simanindo port in Samosir district and at least 4 people were dead and over 192 others missing in the accident. (Xinhua/Agung Kuncahya B.)

Photo taken on June 27, 2018 shows people taking part in a search operation for an object suspected as the wreckage of a boat which capsized in Lake Toba last week, in North Sumatra, Indonesia. The Sinar Bangun boat sank on June 18 after leaving Simanindo port in Samosir district and at least 4 people were dead and over 192 others missing in the accident. (Xinhua/Agung Kuncahya B.)

Photo taken on June 27, 2018 shows people using fishing nets to search for an object suspected as the wreckage of a boat which capsized in Lake Toba last week, in North Sumatra, Indonesia. The Sinar Bangun boat sank on June 18 after leaving Simanindo port in Samosir district and at least 4 people were dead and over 192 others missing in the accident. (Xinhua/Agung Kuncahya B.)

Photo taken on June 27, 2018 shows people taking part in a search operation for an object suspected as the wreckage of a boat which capsized in Lake Toba last week, in North Sumatra, Indonesia. The Sinar Bangun boat sank on June 18 after leaving Simanindo port in Samosir district and at least 4 people were dead and over 192 others missing in the accident. (Xinhua/Agung Kuncahya B.)

Photo taken on June 27, 2018 shows people pulling fishing nets to search for an object suspected as the wreckage of a boat which capsized in Lake Toba last week, in North Sumatra, Indonesia. The Sinar Bangun boat sank on June 18 after leaving Simanindo port in Samosir district and at least 4 people were dead and over 192 others missing in the accident. (Xinhua/Agung Kuncahya B.)

Photo taken on June 27, 2018 shows people taking part in a search operation for an object suspected as the wreckage of a boat which capsized in Lake Toba last week, in North Sumatra, Indonesia. The Sinar Bangun boat sank on June 18 after leaving Simanindo port in Samosir district and at least 4 people were dead and over 192 others missing in the accident. (Xinhua/Agung Kuncahya B.)