Here's our detailed walkthrough for the finale of The McTony Robbery in GTA Online's The Chop Shop DLC. After completing all planning work, it's time to use Tony's submersible to infiltrate his submarine, locate his head of security for control codes, and make off with the valuable Fathom FR36.

Once you've completed all the mandatory preparatory missions, you can start The McTony Robbery from the planning screen of your Salvage Yard.

First, you must go to Paleto Cove to get inside the submersible.

The submersible at the Paleto Cove.

Once inside the submersible, take it towards the sea (as marked on your map). It is best to keep your submersible up as driving towards the sea (and eventually the submarine), as driving it underwater is extremely slow.

You can go underwater when you reach the submarine.

When you get near the submarine, descend underwater. If you're having trouble going underwater, release the 'forward' button and only press the 'descend' button.