Deep Diver

You adapt up to ten willing creatures to survival in the ocean’s black depth, causing their eyes to become enlarged and their flesh hard and cold. Targets gain the ability to breathe water and a swim speed equal to their land speed. Their altered physiology grants them cold resistance and immunity to pressure damage due to deep water. The targets also gain darkvision with a range of 60 feet, or their darkvision is extended by 60 feet if they already have darkvision, and they may generate bio-luminescent stripes or dots on their flesh as a bonus action if desired, shedding light as a light spell.