|This article or section refers to "enhanced version" content in the Xbox One, PlayStation 4, and PC renditions of Grand Theft Auto V and/or Grand Theft Auto Online, that is absent on the Xbox 360 or PlayStation 3 versions.
For a complete list of the features of the "enhanced" version of Grand Theft Auto V, please see here.
- "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.
It is a Free Mode mission that can be completed at any time while The Cayo Perico Heist strand is active after completing the intel gathering. 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.
Pavel tells to 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. Pavel knows the approximate location of a Merryweather submarine test involving the required equipment, which requires the player(s) to find the site and retrieve it from within the vessel in question.
The protagonist is informed by Pavel that in order to approach Cayo Perico with the Kosatka, they will need a special piece of equipment - a sonar jammer. He quickly states that Merryweather are in the process of assisting a trial run of such a device somewhere around San Andreas, but cannot pinpoint where the test site is, because it is jamming his own sonar. He gives players an approximate location to find it.
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.
Once aboard, players must deal with Merryweather mercenaries while searching the submarine for the jammer device which can be located in various positions around the boat. Several Merryweather supply crates can be found with pickups including Health, Body Armor and Rebreathers.
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 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. There is an unseen time limit for the mission and an on-screen timer will appear with 5 minutes remaining. Failing to return to the Kosatka within the time limit will fail the mission. Players can summon their Kosatka to their position, if they did not use it to reach the test site. Once aboard, the mission is completed.