This page of our guide to Life is Strange True Colors contains a description of Part 5 of Episode 5. It covers exiting the mine and getting back into town.
There are four painful memories behind you. Now, however, it's time to face reality. You'll wake up at the bottom of the mine. You need to gather your strength, pick up the light source, and look for a way out.
The path is not difficult, you have to go forward all the time. If you want to, stop and look at the objects in the area.
When you reach the vast open space, your lamp will go out. Alex, however, will come up with a good way to get a new light. She will look for the emotions that are in the area. A strong emotion comes from one specific tunnel, which will light up the area and lead you to the exit.
Go towards the light source. You will hear a story along the way. You'll find out what happened years ago, who was to blame and why people died.
Among the rubble, you will find a very valuable object for you. It will be the last missing piece of the puzzle that will tie all facts together.
Eventually Alex will come out of the mine and will slowly head towards the town. The next part will happen at the bar.