Deep Water Breathing Elemental Water

The Caster can select any willing creatures within 20ft and bestow upon them the ability to breathe water through a set of gills that manifasts in the neck and lower ribs. These gills will allow the creature to survive at depth in very deep water up to 1 mile depth. They are safe from the effects of pressure. Ten minutes before the spell wears off the creature can feel the time limit is approaching.