Wait for Tucker’s Radio message to start this mission. Once you have it activated, drive to the Belknap visitor center. Follow the trail and take out the enemies using stealth as much as possible. Use stealth attacks or equip your ranged Weapons with suppressors. Continue along the path until you reach the Cave.
The Cave will be really dark but if you have the Ears to the Ground skill, you can use your Survival vision to see enemies even behind cover. Take out the guards inside the cave then follow the stairs going outside.
Examine the historical marker here then collect some crafting materials on the picnic table. Follow the path to encounter more Rippers. Take them out using any method you want, then proceed to the arc (this also serves as a Checkpoint).
Follow the path and you’ll encounter more reapers. You can’t sneak in at this point since they’ll automatically know your location and some of them will be charging towards you. You also have to be careful of the sniper from the lookout tower. Utilize cover to protect yourself from sniper fire while dealing with the chargers.
Move from cover to cover to get near until you can pick off the sniper. More Rippers will appear as you get near so deal with them accordingly. Once the fight is over, make sure to loot the bodies then head towards the sniper tower to find Lisa.
After the cutscene, you have to escort Lisa again back to your Bike. This is not a walk in the park since Rippers will intercept you once again. Don’t worry about Lisa since like before, she’ll know where and when to hide. Follow the mission Markers which will lead you to the shortcut going back to the entrance. Finish off the remaining rippers then ride your bike.
After the cutscene, drive to the marked location to meet up with Rikki. Once you’ve reached the location, wait for the cutscene to finish and the mission will be complete.
We have questions and answers related to this topic which may also help you: