The vault on Kadara is likely the key to starting the process that will heal the planet's environment. Explore the vault and determine a way to activate it.
You should check Healing Kadara's Heart mission description for more information about this vault, its secrets, etc.
Correct solution of Remnant decryption puzzle
The Remnant decryption puzzle in this vault locks one of the consoles. Solving it allows you to gain Skill Up +2.