Bounty Reef: 5
3 of them are found swimming around the outside edges of the reef
1 of them is behind and under 2 shipping containers, a red one and blue one kind of stacked, both already have the doors blown off.
1 of them is in a cave that is only accessible by blowing up the sea mine. If you go to the staircase to the big door, with your back to the dingy, it will be next by a sunken buoy to the left side of the chasm, not in the chasm.
Sunken Ashes: 4
1 inside shipwreck, not either of the ones that are in the big lava pool, it is off to the side hanging off a cliff
1 under a stone arch filled with seamines
1 inside a blue container on the sand hill behind the shipwrecked one
1 on the small rock island in the small lava lake.
Sandy Crater: 3
1 inside a shipwreck
1 inside boat wreck (these wrecks are on opposite sides of the reef and sub from each other)
1 at the base of one of the big stones arches right next to the submarine