Speak with Bob
Follow the arrow and turn left before entering cave to find area to get Sand.
to dig here, for the
Collect 4x Sand if You are doing Quest alone, 5x if with friends!
Use sand here
Enter stairs do go down and follow the route to find button
Push the button and go near closest Exit. If doing this quests with a friends, all other must stay down and follow the route to find bridge end.
Enter the place which was previous blocked
If You are doing this quest alone, enter the stairs
If Your friends are waiting, use sand here
Speak to Jolene
to finish the quest.