The human Pathfinder has reactivated a Remnant tiller on the shattered planet H-047c, securing a reliable source of fuel for Initiative ships. The resource deposits will be enough to sustain the fleet for an estimated 300 years. "At least that's one problem solved," said Initiative Director Jarun Tann.
You should check The Remnant Tiller 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 the final tiller console.