Aqueous Affinity

You touch a willing creature to grant it the ability to take action underwater with ease. For the duration of the spell, the target gains a swimming speed equal to their movement speed, and making weapon attacks underwater no longer imposes disadvantage on the attack roll. While submerged in water, the target also has advantage on all Dexterity saving throws.

At Higher Levels. When you cast this spell with a 4th level or higher spell slot you can target one additional target for every level above 3rd.