Namor possesses a high level of superhuman strength, enabling him to lift/press up to 100 tons while in contact with water; his strength gradually decreases according to the length of time he is out of water and can eventually dwindle to no more than slightly above human level. In addition to his great strength, Namor possesses superhuman stamina and durability, a result of his body’s adaptation to underwater pressures. He also possesses superhuman agility, reflexes, and speed, with a maximum swimming speed of roughly sixty miles per hour. Namor is able to fly via the finlike wings on his ankles, and he possesses a telepathic rapport with many, but not all, forms of marine life. Like all Atlanteans, he has a prolonged lifespan and his body is specially developed for underwater conditions, granting him specialized blood circulation to withstand freezing temperatures and highly developed vision to see clearly even in murky ocean depths. This hybrid physiology means he can survive indefinitely underwater or on land (though he would still need occasional contact with water to survive). Namor possesses an empathic bond with his cousin Namorita. When not exposed to water, Namor’s physical attributes gradually decline and can diminish over time to near-human levels, robbing him of his strength and rendering him vulnerable to conventional injuries; renewed exposure to water will immediately restore his abilities. Complete lack of contact with water will prove fatal in about a week’s time. Namor has demonstrated a vulnerability to oxygen imbalance when remaining too long in either water or air, resulting in manic-depressive mood swings; he can prevent this imbalance by dividing his time between the two atmospheres. He has occasionally used scientific or magical means to regulate his oxygen levels. - marvel.com