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This article (or section) refers to content in the Enhanced version for the PlayStation 4, Xbox One and PC release of Grand Theft Auto Online that may be absent from other versions.
For a complete list of the features of the Enhanced version for the PlayStation 4, Xbox One and PC version of Grand Theft Auto Online, please see here.
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Why look elsewhere, kapitan, when we are standing in the answer! We obtain sonar jamming equipment, this submarine can swim through Mr. Rubio's hot tub and he would not feel a thing! Or if you prefer, I leave you just off the coast. Up to you.
— Pavel's briefing on the planning screen.

Kosatka is a prep mission featured in Grand Theft Auto Online as part of The Cayo Perico Heist update, and a free roam mission that can be completed at any time while The Cayo Perico Heist strand is active. It is one of six missions within the Approach Vehicle category that is mandatory for completion, but becomes optional if another of the missions has been completed.

Overview

Mission Details:
Steal sonar jamming equipment. This will allow your Kosatka to remain undetected off the coast of Cayo Perico.
Heist Impact:
With your Kosatka submerged off the coast, approach the island undetected in scuba gear.

Pavel briefs the player that El Rubio's island has an extensive sonar network, and that if they want to get close to the island in the Kosatka they will need to steal a sonar jammer. However, such equipment is only available from private military companies with contracts, and Merryweather Security is the only one around the state.

Completing this setup allows the player(s) to approach and leave Cayo Perico in the finale using the Kosatka.

Walkthrough

Mr. Rubio's island has extensive sonar network. If we want the submarine to get close, we will need a deflector of some kind. This kind of thing is military tech, but luckily this is America, so of course there is private company with contract. Merryweather... you have heard of them? They have new submarine, latest model, well equipped. I know location of test, so we can start there. They must have what we need... I cannot see anything on sonar.
— One of Pavel's briefings.
Travel to the last known location of the Merryweather submarine that contains the Sonar Jammer.
You can request a Dinghy or Moon Pool Vehicles from the Kosatka to travel to the test site via the Services section of the Interaction Menu.


The player is instructed to go to location of the test site around the northern side of the map, which Pavel cannot pinpoint the exact location of the submarine because it is jamming his own sonar. The player may encounter a patrol group on the water surface of the test site, consisting of a Buzzard helicopter and three Dinghy boats. The enemies on board will open fire at the player on sight or when attacked.

Search beneath the ocean Blips-GTAO-QuestionMark-Yellow.png for the Merryweather submarine and find a way inside.

Once there, Pavel advises them to swim underwater and find the device aboard the Merryweather submarine. An access Corona is visible on the top hatch on the sail of the submerged Ramius. Entering the hatch will spawn the player aboard at the aftmost hatch point.

Search the submarine for Merryweather's Sonar Jammer.

Once aboard, players must deal with Merryweather mercenaries while searching the submarine for the jammer device, which can be located either on the bridge, the torpedo room or the engine room. Several Merryweather supply crates can be found with pickups including Health, Body Armor and Rebreathers.

You collected the sonar jammer.
The nearby crate contains Rebreathers that can be used during your escape.

Upon finding the device they must return to where they entered the submarine, during which time they can pick up a rebreather mask if they are not wearing scuba gear. Once outside the submarine, players must bring the equipment to the Kosatka, with Merryweather Buzzard Attack Choppers pursuing them during the journey; they can remain underwater to avoid being fired upon, though only for a short while if they are using rebreather masks. Once aboard the Kosatka, the mission is completed.

Possible Locations

Pavel's Dialogue

Transcript
The GTA Online Protagonist starts the prep mission and exits the Kosatka submarine.
Pavel: Mr. Rubio's island has extensive sonar network. If we want the submarine to get close, we will need a deflector of some kind. This kind of thing is military tech, but luckily this is America, so of course there is private company with contract. Merryweather... you have heard of them? They have new submarine, latest model, well equipped. I know location of test, so we can start there. They must have what we need... I cannot see anything on sonar.
Alternative: If you wish to use submarine to get to Mr. Rubio's island undetected, we will need to deflect their sonar. But such equipment is not available on open market... we will need to borrow it. And I have a lender all lined up: Merryweather are running tests on their new submarine. Latest model. It will have what we need. I would ping you exact coordinates, but... they are blocking my sonar. I know the general area for the test... we start there.
Alternative #2: If we are going to use submarine to approach Mr. Rubio's island, we will need to deal with sonar network. A deflector is the only way, but it is not the kind of equipment you buy in a store. It is the kind of equipment you steal from private military contractor. They are called Merryweather, and they are running tests on their new submarine... and its sonar deflector. I have location of the test, but my sonar is blank for this area. This is a good sign!
The player approaches the Merryweather test site.
Pavel: Look... Patrol boat and helicopter. You dive beneath them, you will not have far to go.
Alternative: There. You see the boat and helicopter? That must be the spot. Time to get more than your feet wet, kapitan! Dive time!
Alternative #2: Do you see the helicopter and patrol boat? They must be above the submarine. Dive, dive, dive!
The player dives down to the Merryweather submarine and enters it.
Pavel: Did you make it inside? I cannot tell from sonar! This thing is impressive. It will be small enough to carry... a box of wires and switches and so on.
Alternative: Are you inside? I still see nothing on sonar. Extraordinary. The tool will look like box full of wires and switches and antennae.
Alternative #2: Are you in? Nothing on the sonar... which is just what we want, of course! The deflector will be a small box with switches and antennae and so on.
The player steals the sonar device after locating it inside the submarine.
Pavel: Aha! I see you on sonar now... you must have found it. Very good... time to make your exit, I think!
Alternative: Have you got it? The whole submarine just popped onto my sonar! Good work, now go! Back the way you came!
Alternative #2: Well, well, there you are! You popped onto my sonar as soon as you took the scanner. Now, time to leave!
The player exits the enemy submarine and swims to the surface.
Pavel: Welcome back to the surface, kapitan! Just in time for the incoming helicopters! Get the deflector back to me.
Alternative: You are back on the surface, kapitan! Well, things are getting busy up here.
Alternative #2: How was your swim, kapitan? I hope you are not too tired... There are some very concerned helicopter pilots looking for you. Get the deflector back to our sub!

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