Hidden Packages are basically suitcases full of cash. However, you will have to spend a good amount of time under water if you intend to find them all. You may also stumble upon different weapons, armor, and health kits while looking for these hidden packages.
Hidden Package #1
Location. The first package is in the northwestern region of the map, just east of the Port of South Los Santos. It is next to the broken tail end of a large aircraft. You can’t miss that glowing suitcase.
Hidden Package #2
Location. On the eastern end part of the map, exactly in line with Package 1 is another package located near an old sunken Cessna-like aircraft.
Hidden Package #3
Location. This package is located in the eastern part of the map just southeast of the mountain range. Look for an underwater wreck of a truck, and you should be able to find it in the container.
Hidden Package #4
Location. This package is inside the wreckage of an underwater carrier aircraft fuselage, located northwest of the tip of the western ‘nose’ part of the map.
Hidden Package #5
Location. You can find this package below the southeastern edge of the ‘nose’ part of the map. It’s on a sunken frigate type boat.
Hidden Package #6
Location. This package is on a sunken and badly rusted submarine ship, west of the Pacific Bluffs and slightly south.
Hidden Package #7
Location. This package is located in the waters between the western islands of the map. Dive down and look for a large shipwreck. The package will be under a brown gate.
Hidden Package #8
Location. This package is located in the seas next to the Palomino Highlands, near the island. Look for a steam ship here. There is a wooden wheel that has the package under it.
Hidden Package #9
Location. In the river area that runs north of Port of South Los Santos, there is a sunken wooden platform in the relatively shallow waters. The package is on its surface, which is also covered with weeds and wooden logs.
Hidden Package #10
Location. This package is located in the southeastern part of the map. It is near the tail of a large sunken jet aircraft.
Hidden Package #11
Location. This package is located south of the western part of Port of South Los Santos. This is probably the most difficult package to find, even though the waters here a relatively shallow. The package itself is lying in the lower portions of what seems like a shipwreck part. The package itself is hidden among the algae and underwater plant growth, so keep your eyes peeled.
Hidden Package #12
Location. The final package isn’t actually located underwater. This package is located in the Altruist Camp on Mount Chiliad. You need to bring three hitchhikers with you in order to open the camp. The package itself is on the porch.