Climb Ev'ry Mountain

 is a quest in Fallout: New Vegas.

A sniper is killing NCR soldiers and civilian refugees in the Bitter Springs Refugee Camp. Captain Gilles wants you to track down this unknown assailant, who has been hiding in one of the hillside caves to the north of Bitter Springs.

Quick walkthrough
There are three Great Khans supply caves around Bitter Springs. Each cave also contains a locked gate, behind which are what remains of the Great Khans supplies including two Great Khan Supply Caches and one Radioactive Supply Cache which are required for the quest No, Not Much. When the quest is active in your Pip-Boy 3000, the first cave location will be marked on your map. It is north-west of the camp (north-east of Bloodborne Cave), at the end of a small pathway. This path can be very difficult to locate as it is well hidden among rocks that cannot be climbed and are very easy to become stuck in. Just before the path you will find several fire geckos inhabiting some red rock the path is just to the north when you enter back into grey rock and is slightly to the right. Inside is Oscar Velasco, a member of the Great Khans who lost his family three years before and now seeks vengeance by killing the occupants of Bitter Springs. He can be convinced to let go of his anger and move on to Red Rock Canyon with a Speech check of 50; if successful he will also give the Courier a key that unlocks the gates to the supply caches located inside each of the caves. If you are travelling with Boone or an NCR soldier or ranger (from the Emergency Radio), Oscar will become hostile. So Alternatively to avoid this you can simply have Boone wait outside and go perform the speech. (Note: Have Boone wait far enough from the cave entrance that he does not detect Oscar otherwise when Oscar leaves the cave Boone will engage him and you will receive negative fame from The Great Khans.)

The other two caves are immediately north of the NCR camp. One of these two caves contains several giant ants and barrels of radioactive waste, while inside the other cave are some young night stalkers. The ant cave is the closest to the camp, and the gate inside has apparently been torn down by the mutated ants, so Oscar's key is not necessary to retrieve the stash there. The night stalker cave is a little further north of the ant cave at the end of a path just to the right of the ant cave. While it helps to have it, the locks can be picked before obtaining Oscar's key. The locks on the gates are Easy (25 Lockpick) so they do not pose much of a challenge.

Bugs
If traveling with Boone as a companion Oscar will attack, have him wait outside

in the cave oscar is hiding in, there is a gate to the left of the entrance corridor, and another corridor to the right, opposite the gate. if you follow this corridor, there is a bear trap on the floor near the beginning, and three frag mines near the end. the frags are lined up across the corridor with the one on the right sitting still and unarmed, while the two on the left are glitching in and out of the corridor floor like bouncing bettys having a seizure. these two frag mines are also unarmed, but much more difficult to pick up.

Behind the Scenes
The name of the quest is a reference to the song featured in the movie "The Sound of Music".