Wayanad Landslide: People can survive inside the debris for a week to a month, such cases have been found before, what should be the conditions?

The landslide that occurred in Wayanad on July 30 caused massive destruction. Thousands of people are in relief camps, while hundreds of lives have been lost. Meanwhile, rescue teams are continuously working. Only on Friday, four people came out alive from the debris after four days. On the basis of old cases, it is believed