The arks in Rage 2 are shelters where you can find equipment, weapons and get new skills. In addition, for each captured ark you get money and points for one of your allies.
Junkers Pass Ark
On this Ark you will encounter when traveling through the Eastern part of the Twisting Canyons.
To get to the Ark, you must first eliminate all enemies guarding the site.
After eliminating opponents, go to the ark and open it with the focus ability.
After entering into the ark, you get shatter ability. This ability is going to help you in defeating enemies.
Quake Hill Ark
The ark is located in the south-eastern part of the location, at the end of the map.
At the entrance to the building, move straight to the next door. There you will encounter a bridge, you cannot jump over it.
To go further you need to jump from the purple light. This will take you to the next part of the site.
Behind the bridge is the ark, open it using the skill.
Once in the ark you will get the vortex skill. It helps you in defeating groups of enemies.