When Good Heists Go Bad - Saints Row The Third
Once in control, start by killing the armed tellers. Proceed to the second and third floor while killing all enemies. After reaching the vault and the scene, you'll have to continue upstairs. You can take out the enemies on the lobby as well.
Continue to the third floor. You may find a fan wanting your autograph. Plant the explosives on the marked spot on the floor then watch the following scene. Once done, get behind cover and defend yourself from the incoming waves of SWAT officers. An attack helicopter will appear as well so shoot it as well until your own chopper arrives.
Once you're riding the vault, continue killing the guards. You'll have to shoot down police choppers as well during the process. Continue doing this until your chopper gets shot down. Mission complete.
When Good Heists Go Bad
After the mission, you have the chance to customize your character. Watch the following scenes.