Dive

You imbue one creature that you touch with magic that surrounds their head with breathable air and allows them to traverse aquatic environments with ease. Until the spell ends, the target gains a swimming speed of 60 feet, can breathe normally, and does not suffer disadvantage on attack rolls being made underwater. 

Additionally, rather than the caster having to maintain concentration for the duration, the affected creature must maintain concentration in order to continue the spell for its duration.

Using a Higher-Level Spell Slot. The number of targets increases by 1 for each spell slot level above 2.