Search and rescue operations are in their seventh day, with 27 predominantly teenage boys, aged 13 to 19, still unaccounted for beneath the debris.
The Al Khoziny school in Sidoarjo, East Java, collapsed last Monday during afternoon prayers, reportedly due to its foundations being unable to support ongoing construction work.
Rescuers have deployed heavy equipment and are 60 per cent complete with search efforts, which are expected to conclude on Monday.
Despite extensive efforts, including tunnelling and using sensors, no signs of life have been detected among the missing students.