|1||END 5||Water is your ally. You no longer take radiation damage from swimming, and can breathe underwater|| 000e36f9 (Aquaboy)|
|2||END 5, LVL 21||You become totally undetectable while submerged.|| 001d248d (Aquaboy)|
- While underwater, weapons cannot be equipped, and the Pip-Boy light does not illuminate a very large area. Accordingly, there are no enemy encounters other than mirelurks, which are commonly found around Nahant.
- The benefits of this perk can also be obtained by eating mirelurk cakes and using items or equipment to boost Radiation Resistance.
- This perk may be useful while exploring some of the many 10+ Rads areas in the beginning of the game, when items that provide Radiation Resistance are scarce. There are also plenty of sunken locations throughout the Commonwealth and Far Harbor, in addition to scrappable underwater materials such as concrete near workshops.
- There are at least three missions involving being underwater for an extended period of time: Pull the Plug, Here There Be Monsters and Clean the Water Supply.
|1||You no longer take Rad damage from swimming and can breathe underwater.|| 000e36f9 (Aquaboy)|
- Nuclear Winter
|1||No longer take Rad damage from swimming and can breathe underwater.|| 00479b1f (Aquaboy)|
Neither the Aquaboy/Aquagirl nor Lead Belly perks prevent radiation damage when collecting dirty water from a river or a water pump.