Resistance to Cold: Excellent protection from cold and cold-based attacks.
Hyper Swimming: He can swim at Good speed.
Water Breathing: As an Atlantean U-Man is able to breathe water.
As per Atlantean physiology outside of a watery enviroment and without the aid of a water re-circulation system Uman will suffocate. After 15 turns and each turn thereafter he must make an Endurance FEAT roll to remain conscious. Normally a Yellow roll is required. Humid conditions lessen this to a green FEAT while arid raise it to red. In addition Uman loses 1 point of health per turn he is out of the water. This damage is automatically healed as he immerses himself.
Chemistry, Biology, Physics