Nan Yang from Martian Camp want you to help him with rescue some colonist from Nest.
In the Nest will be Hitomi Amasawa.
How to complete the quest?Edit
After get to the Nest. After speak with Hitomi you will need simply kill all the Spiders and Their Queen.
To kill the Queen best way is use some small turrets to help you.
After that you will need to go outside to the quest ended.
Sometimes the NPC block in the tunnels and do not want to get out of from Nest. The best then is load an earlier save or try to help them out of the underground.