Ye Feng now couldn’t afford wasting time, he quickly cast out an Immortal Technique, and took a deep breath, in a flash, a massive amount of air entered in his back, ran through his several meridians, and got stored up there in his back!
His entire back skin turned somewhat swollen, bulky and hard, just like a tortoise shell in general, not only it stored up enough air to be used while breathing underwater, but that shape could also be used to accelerate his swimming speed.