Open the Safe
Once you gain control of Michael after the short scene, head over to the guards which are indicated as a red marker on your radar and shoot around them to make them run into the closet.
Press up on the [D-Pad] to detonate the bomb via the phone, them follow the corridor around to reach the safe. Gather as much cash as possible before following Trevor out into the corridor to be grabbed by security. Here you’ll want to hold down on the [D-Pad] to switch over to Trevor, then aim for the securitys head by holding [L2/LT].
Escape the Police
Sprint towards the end of the corridor by holding [X/A], then press [R1/RB] to take cover by the crates and wait for the bomb to explode. Now open the shutter and take cover by the pillar and take down the oncoming Police. Once you get the prompt to switch back over to Michael, do so, and sprint towards the car up ahead and take cover.
Tip: Hold [R2/RT] to shoot the Police without people, so you don’t take any damage.
Once a few minutes have passed, switch back over to Trevor and sprint towards the vehicle up ahead whilst taking out the police along the way. After the scene has come to a close, you’ll gain control of the vehicle, so hold [R2/RT] to accelerate and follow the yellow marker to reach your destination.
Unfortunately, the vehicle is now out of use, so defend Michael by taking out the cops until the next scene begins to finish the Prologue.