How to Complete Mission #54 – Monkey Business in GTA 5
This mission is one of the most intense and spectacular in GTA V. Here Michael and Trevor again have to get involved in the shady business of federal agents, who, according to the classics, cleverly manipulate the heroes. The goal is to steal a particularly dangerous nerve gas from a top-secret laboratory. Everything is serious: scuba suits, Cargobob helicopter, tasers, alarms, shootout and, of course, escape with the container into the sunset.
The Underwater Part: Beginning Operation

The mission starts with Michael traveling with Agents Hines and Norton to a dive point in a rubber dinghy. Here he is given a diving suit and the team goes underwater. The underwater portion itself is fairly linear, but requires care.
On the way there is an obstacle - a metal grid, which must be cut with a gasoline torch. And here it is important: the fuel of the tool is not infinite. Therefore, you need to bring the torch close to the green dots on the bars, turn it on, cut and quickly turn it off, so as not to waste too much. When all the marks change color to red - the passage will be open.
After that Michael swims further behind the agents and pops up indoors. Here begins the second part of the mission, already inside the laboratory.
Covert infiltration: work quietly

At this stage you need to act covertly. The stun gun is the main tool. It is important to knock out enemies without noise. As soon as the first scientist appears, Michael must carefully approach and knock him out with an electric shock. After a moment another employee comes out of the next door - he also needs to be neutralized. After that, the guard will let him inside without any problems.
Further the route leads through the corridors of the laboratory. Here it is important to shock at least eight opponents with a taser to fulfill one of the conditions for the gold medal. The main thing - do not make noise until the alarm. If you do everything carefully, you can reach the room with gas without a single shot.
When Michael takes the container with the substance, the alarm goes off. Stealth is over - the fight begins in earnest.
Fight and Breakout: The Heat Begins

Now the game changes dramatically: enemies swoop in from all sides, and a brutal firefight begins. This is where the combat arsenal comes to the rescue. It is desirable to prepare an automatic rifle or shotgun in advance. You need to cling to the shelters, aiming enemies at their heads (this is another condition for the gold medal), save ammunition and stay out in the open. It's important not to forget about Michael's special ability: when activated, time slows down, and you can easily send a couple of especially accurate bullets to the head.
The exit to the outside area meets the player with a powerful defense - the guards here are no longer ceremonious. Any heavy guns will do. The main thing is not to lose pace, but also not to rush without cover. When the road is cleared, Michael goes to the drop point, where he leaves a container with gas.
Switching to Trevor: delivering the cargo

After Michael completes his part, the control passes to Trevor. He is already in the sky, piloting the brand new Cargobob, bought with the looted millions. His task is to carefully pick up the container and deliver it to the airfield.
You need to pick up the cargo carefully: fly up, descend right above the container, wait for the prompt on the screen and release the slings. If everything is done correctly - the cargo is fixed. The flight to the airfield passes without any special events, but here the main thing is not to shake the container and not to crash into rocks or the ground.
Upon arrival, it is necessary to precisely lower the box on the platform, without violating the angle of inclination. This is followed by a landing. Then in the cut-scene agent Hines for the sake of cover theatrically shoots himself in the leg, and the old familiar to fans of GTA IV - the agent from Liberty Paper appears. The spectacular scene ends, but the story continues.
The Final Touch: Patricia

After the main mission, Trevor has one personal thing left to do - to get Patricia Madrazo back. He takes her back to Martin, and this scene unexpectedly shows another side of the wild Trevor - he is sad, barely containing his emotions. This moment is a little distant from the mission itself, but it makes the ending particularly atmospheric.
How to get a gold medal
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You must knock out eight enemies with a stun gun during the stealthy infiltration phase. Do this until the alarm is raised, as long as there is an opportunity to act quietly.
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During the firefight after the alarm is raised, you must take at least fifteen headshots. Aim carefully, especially in narrow corridors.
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The entire fight and the rest of the shooting should be as accurate as possible - the final marksmanship should be at least seventy percent.
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The entire mission, including the dive, stealthy infiltration, firefight and helicopter flight, should be completed in thirteen minutes and thirty seconds.