Aquagirl Aquaboy (Fallout 4)

Aquaboy (or Aquagirl, depending on the Sole Survivor's gender) is a perk in Fallout 4.

Characteristics
The first rank of this perk grants the Sole Survivor the ability to swim in any body of water without receiving radiation damage, it also allows for underwater breathing. With the second rank, they become undetectable while being submerged.