
Forestry officials, Disaster Prevention and Mitigation officials, border patrol policemen and officials from other agencies started preparing equipment and foods to survey shafts leading to the cave.
Some prepared equipment to climb down a 40-metre deep shaft after they climbed down on Friday to find a chamber with more passages. They plan to survey the passages on Saturday.
On Saturday, 50 officials from the National Parks, Wildlife and Plant Conservation Department in Chiang Mai will also join the search.
The officials took along food and drinks before embarking on the search operations.
Meanwhile, a monk led relatives of the missing 12 youths and their assistant coach to hold a morning prayer inside a tent set up for the families. The families appeared exhausted after waiting in the tent for days.