Comprehensive guide to the Planning Work missions for The McTony Robbery, including stealing Tony's Submersible, Sonar Equipment, and the optional weapon disruption.
The McTony Robbery is one of the Salvage Yard Robberies in GTA Online's The Chop Shop DLC. The Planning Work missions involve acquiring Tony's Submersible and Sonar Equipment, which is important for the submarine infiltration, as well as an optional mission to disrupt enemy weapons.

Planning Work missions are mandatory missions you must complete to do the robbery. There is always one optional disruption mission that helps make your final robbery mission relatively easier. You can start all your planning work missions from the planning screen by accessing the computer in your Salvage Yard.
As with all the robberies, The McTony Robbery also has two mandatory and one optional planning mission.
Planning Work 1: Tony's Submersible
In this planning mission, you must go to Elysian Island and steal Tony's submersible. This will be used to reach the underwater submarine with our target vehicle in the finale.
When you get to Elysian Island, you will find a lot of security guards.