The Merryweather Heist is a mission in Grand Theft Auto 5 offline.
The first heist that Trever joins right after he is introduced in the storyline.
In the first mission of the heist, Three’s Company, Micheal, Trevor, and Franklin gather together to discuss the mission.
Quick Answer: There is a no different out outcome. There is no way to successfully steal the superweapon.
Spoilers: There is a video below going through both missions and results.
The main goal is to steal a secret government superweapon.
GTA 5 Freighter and Offshore missions have the same outcome.
The missions set-up is different and you will have different activities.
For the Freighter, you must improve Franklin snipping abilities as he will be snipping in the Freighter mission.
For the Offshore, you have to improve Micheal flying abilities as he will be the pilot if you choose the Offshore mission.
In order to perform the heist, Trevor must perform a couple of preparation missions to obtain the necessary equipment.
The number of preparation missions depends on the approach, though both approaches require the player to acquire a Submersible.
The Submersible is going to be used underwater in the ocean to gather the superweapon at the end of the mission.
At the meeting, they discuss what are the preparation things that they need.
There are to approach which is the Freighter or offshore.
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The two approaches’ outcome of the mission is the same.
In the freighter, you’ll be snipping and setting bombs around the freighter.
After that, you’ll be picking up the submarine to pick up an item.
In the offshore, you’ll be flying a submarine to the ocean with a helicopter to pick up the item.
While on your way to the ocean, you have defended the helicopter from enemies.
Both approaches do NOT earn you reward money. It really does not matter what you chose other than your preference.
If you like snipping the freighter is for you or if you like flying then offshore might be the best for you.
If you choose the freighter approach, Trevor calls Franklin and suggest him to improve his shooting at the Range.
As Franklin will be the one snipping at the beginning of the mission.
Only one mission is required for the preparation of this mission (Minisub).
After Trevor explains the mission details to Micheal and Franklin at his cousin house, they head to the freighter location.
Franklin will be on sniper duty so he is dropped off at the snipping location.
Hours pass and the mission resume in the late evening and you’re switched to Micheal.
He waiting with a small boat right beside the freight.
While Franklin is snipping the enemies inside the freighter, Micheal will be planting the bombs at the game-selected locations.
After Micheal and Franklin clear out the boat, then get the device and leaves the freight.
When Micheal leaves, he detonates the freight and then Trevor takes the minisub in search of the superweapon.
After Trevor gets the item from the sea floor then, Floyd uses the crane and life the minisub up to ground.
Soon after, Lester comes in hospital ropes and warn the team that super weapon is highly dangerous and that they should return asap.
Of course, Trevor does not want to but Micheal promises him to find him another heist.
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If you picked the offshore, then Trevor will suggest to Micheal to go to the Flight School and work on his flying skills.
There are 2 missions for the preparation of the heist. The first is the Minisub and Cargobob.
At Floyd’s apartment, Trevor explains the heist plan in details.
All three drives to Sandy Shore hangar and Trevor to start the mission.
Micheal and Franklin get in the cargobob and Trevor gets into the minisub.
Afterward, Micheal flies the cargobob to the ocean (Merryweather test site) to get the superpower device.
After you get to the site, then you drop the minisub to the ocean and there is a character switch to Trevor.
He uses the phone app to track down the device.
After he finds the device, the minisub gets attached cargobob and lifted.
On your way back, the Merryweather helicopter will try to shoot you down.
You’re going to switch to Franklin to try and shoot down the Merryweather buzzards.
After you’re done defending then you head back to Sandy Shores.
At Sandy Shores, Lester comes in and advice to return back the device because is highly dangerous.
Of course, Trevor is going refuse but Micheal promises him another score. Rock Star made the same mission for Xbox One and PS4.