The driving force of Zhang Tie's speed in the water came from the reverse pulling force caused by the vacuum effect of seawater. This force came from Castle of Black Iron. Therefore, it could be completely controlled by Zhang Tie's spiritual energy. It could be big or small.
A few years ago, when Zhang Tie arrived at Ewentra Archipelago by sea for the first time, he traveled over 10,000 miles in 3 days with the help of Castle of Black Iron and ocean currents. At that time, Zhang Tie was restricted by his ability to bear water friction. Due to the existence of friction and pressure in seawater, Zhang Tie could even gain iron-body fruits at the same time while moving forward in seawater.
This time, after promoting to a knight, Zhang Tie's knight's consciousness could control the space absorption tunnel of Castle of Black Iron more flexibly. His ability to bear water had reached a terrifying level. Additionally, Zhang Tie had a water-proof body, which could protect his movement in water. Additionally, he was protected by his battle qi; especially with the effect of senior rapid moving skill, his speed in water had completely surpassed his flight speed and reached an unimaginable limit.
This was also the maximal speed that Zhang Tie could bear in water at this moment. When he reached this speed, Zhang Tie's protective battle qi and ability to bear water encountered an unprecedented challenge and stress that Zhang Tie had never imagined.
This challenge and stress originated from something that Zhang Tie had never cared about — — tiny bubbles in water.
When Zhang Tie reached a certain speed in water, a lot of tiny bubbles that could not even be seen by naked eyes came into being. As Zhang Tie moved forward, a lot of tiny bubbles came into being in the water due to the different pressure in front and behind him. The bubbles were on the contact surface between his body and the water. In each second, numerous tiny bubbles would come into being. At the same time, numerous tiny bubbles would burst. The bursting of bubbles in water brought a great impact to Zhang Tie.
When the bubbles burst, Zhang Tie would feel a great impact. The moment the bubbles burst, they would cause a great impact and high-temperature micro-jets, which struck Zhang Tie's body like numerous high-temperature water arrows and water hammers. They corroded Zhang Tie's protective battle qi and caused dense high-frequency noises, which made Zhang Tie feel how it felt to fly in a hail of bullets.
After doing this for a few times, Zhang Tie found that as long as he reached a certain speed in water, such a strange phenomenon would happen. He could not help but ask Heller.
"Heller, what's wrong? How could I produce those terrifying bubbles when I reach a certain speed in the seawater? Additionally, why are those bubbles so destructive?"
"It's because of the cavitation phenomenon and cavitation erosion caused by the friction between your body and seawater!" Heller answered briefly.
Cavitation phenomenon and cavitation effect? Zhang Tie became more confused. He had never heard of these two words before.
"This is a physical phenomenon. When the local pressure in the liquid is reduced to the saturated vapor pressure of the liquid, the process of the formation, development, and collapse of vapor or gas bubbles in the liquid or at the liquid-solid interface is the phenomenon of cavitation. Air bubbles rapidly formed, expanded and collapsed, forming shock waves or high-speed micro-jets in the liquid, as well as heat release. The noise and corrosive effect were cavitation erosion, which was also known as cavitation erosion! Castle Lord, you can take a look at the paddles. Those corrosive marks on the old paddles are caused by cavitation and cavitation erosion caused by the friction between the paddles and seawater! "
The appearance and collapse of the trivial air bubbles in the water could cause sharp shock waves. Jet, high temperature and corrosive effect. Zhang Tie was shocked, 'Isn't this the effect of the most powerful battle qi? If knight's battle qi could have such an effect, it would be 10 times more powerful. '
As Zhang Tie moved forward rapidly in the water, he sensed and comprehended the process of the formation of those tiny air bubbles using his knight's consciousness.
At this moment, Zhang Tie's maximal speed in the water was almost 3 times that of his cruising speed in the air. He could move about 600 m per second in the water and over 2,100 miles per hour in the water.
Previously, it took him 3 days to reach Ewentra Archipelago from the nearby waters of Huaiyuan Prefecture; however, it only took him about 5 hours this time.
The vast ocean was a natural moat for others; however, for Zhang Tie, it was a highway and super express lane that he had been dreaming about. He had to consume his battle qi in the sky; however, in the ocean, he only needed to open the space siphon tunnel in Castle of Black Iron. It was both simple and convenient.
With a sound "splash", Zhang Tie flew out of the shimmering sea and came to over 100 m high in the air. After that, he took out his compass and confirmed his location by the stars in the sky. After recalling the sea area map of Ewentra Archipelago, he flew towards the southeast.
Zhang Tie's first target was Demon Snake Island.
'It's time to end the animosity between me and Demon Snake Island a few years ago. '
'When those b * stards in Demon Snake Island dispatched people to kill me, they might not have imagined that I could come back so fast. '
Those people in Demon Snake Island were Zhang Tie's main targets. After killing them, he could not only take revenge but also do a good deed for Ewentra Archipelago. Additionally, he could eat fruits and improve his battle strength. If he was lucky, he might move the treasuries of those b * stards in Demon Snake Island. How could he find such a good thing?
Zhang Tie flew very high in the sky. Those people on the sea could barely see him. 'Of course, I can't look like 5 years ago. It seems that my look has not changed over the past 5 years. Therefore, as long as the rotating chakra ceremony of Huaiyuan Palace ends, my identity would be exposed soon. ' As the two young and famous figures were both knights, even though they were tens of thousands of miles away from each other, they would still be exposed.
Thankfully, Peter was a white man. Although white men were strong in body, their looks matured very fast. In the words of Donder, with his sharp tongue, they deteriorated very fast. The looks of white men at 16 or 17 years old were quite different from those at 21 or 22 years old.
"Heller, do me a favor. Show me Peter's look at 21 or 22 years old." Heller wanted to have a good impression first so that he could change his look easily.
"The period between the ages of 16 or 17 to 21 or 22 is the most important growth period in a person's life. It is also the formative period. During this period, a person's appearance will be affected by the environment, temperament, living habits, and other aspects. The growth of one's appearance may show completely different changes in these five or six years. What do you want to change into?" Heller replied in his sea of consciousness.
"Ahh, is it that big?"
"Of course, if a young man from the age of 15 or 16 to the age of 21 or 22, even if he was originally handsome, he would become extremely wretched. On the other hand, if a person with an ordinary face lived in a happy and healthy environment from the age of 15 or 16, lived a life full of sunshine, and faced everything with tolerance, that person would also become very handsome. Flying will make people ugly, but sunshine and tolerance will make people beautiful. What do you want to become?"
After hearing Heller's words, Zhang Tie started to sweat a bit. When he recalled Heller's handsome look which was like that of the Sun God, Zhang Tie's heart raced. No matter what, nobody wanted to be an ugly freak. "If so, try to change towards a better way. Just take it as how I would look in the best environment in the past 5 years. However, don't let those who have seen me not recognize me when they meet again!"
"No problem, your charm and the basic shape of your face will not change. I guarantee that those who have seen you before will quickly recognize you when they see you again!" After being silent for a second, Heller asked, "Let me confirm it once again, do you want to change to the best look?"
"Yes, the best!" Zhang Tie confirmed...
"Open your body-changing bloodline. I will directly project that dynamic template into your body-changing bloodline so that you could look like that automatically. Later on, that template would also change to the best look according to time. You don't need to worry about that..."
"Fine!"
After opening his spiritual energy and body-changing bloodline, Zhang Tie felt that Heller had projected a template into his body. Closely after that, his look and figure started to change slightly. As the body-changing bloodline was activated, it started to change itself.
Zhang Tie didn't know how he looked like; however, he knew that Heller would not cheat him.
Only after flying for over 1 hour, Zhang Tie had seen an island on the sea level in the distance.
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