Activate the Elevator is an Objective in the Quest Operation Sancus in Destiny 2.
Access the terminal to activate the elevator platform.
- Having cleared out the Fallen here (or the majority of them) you will be able to access the elevator to go deeper.
- Go to the far end of the walkway on the top level to find the computer you need.
- Just interact with it to have the elevator under your feet start on its way down.
- Listen to what Rasputin has to say before you reach the bottom.