Vidura, Pandavas and Lakshagriha
Once, Duryodhana asked his father Dhritrashtra to send the new yuvraj to Varnavat for yearly festival. Dhritrashtra could not refuse Duryodhana and he requested eldest pandava to visit the Varnavat as his representative.
All five pandavas alongwith their mother Kunti reached Varnavat. Meanwhile Duryodhana sent Purochana to build a palace which was highly inflammable which was aptly named as Lakshagriha. The palace was ready in time and pandavas stayed in the same palace.
However, the wise Vidura had sensed something wrong, so he enquired and sent a digger to dig a secret tunnel from Lakshagriha to a river. The tunnel digger reached pandavas and offered to dig a tunnel for pandavas. Thus secretly, the work to save pandavas begun in the house of Lakshagriha.
After the work of tunnel digging was complete, pandavas were looking to find an appropriate day to make their next move. The tunnel has been made carefully and Purochana was not aware that a tunnel exists at Lakshagriha.
Pandavas invited the people for a feast. The feast was grand and everyone enjoyed them. After the feast everyone left and purochana was also sleeping. Seeing an opportune moment, pandavas set the palace of lac on fire. Then they used the tunnel dug earlier to escape from the burning palace. Bhima carried his mother and all his brothers through the tunnel. Purochana, became a victime of his own design and was burnt while sleeping.
On that fateful day, a bhil woman with her five sons also came to the banquet and somehow they also became the victim of the fire.
Thus, by the foresight of Vidura, pandavas escaped from the ill will of Duryodhana and Shakuni. When they reached the end of the tunnel, a boat was waiting for them at the banks of river ganges, thus completing the escape of Pandavas.