He repeated this until the tide calmed; by then he was so exhausted that his face had turned white. When the tide came again that night, he took the wooden sword with him and leapt into the waves to again train his sword skills. However, unlike the mountain torrents where all he had to contend with was the force of the water heading in one direction, the forces of the waves came from everywhere; whenever he could not take it any longer, he would dive down to the sea bed to avoid the waves.
From then on, he trained twice a day and within a month, he felt his internal energy had made great improvements. When he used the wooden sword on dry land, he was able to produce a faint sound that sounded like sound of the tide. Whenever the Divine Eagle sparred with him, it started to avoid the sword and did not dare to meet it with its wings.
One day, Yang Guo was getting deeply engrossed in the sparring sessions and slashed the wooden sword with all his might. The Divine Eagle called out and leapt to the side. Yang Guo could not withdraw the force of his sword in time and it struck a tree. The wooden sword broke but the tree was cut in two.
Yang Guo held the broken sword's handle and thought, "This wooden sword is light and fragile, but it was still able to cut a tree; this is because of the internal energy in my hand. If in the future the tree breaks and the sword doesn't then I won't be too far off the divine skill of Senior Dugu."
Spring went and autumn came, the months flowed by. He trained his sword arts in the sea's waves night and day, whatever the weather. The sound produced by the wooden sword was getting louder and louder to the point where it was able to produce great volume of noise. After a few months, the sound from the wooden sword got quieter and quieter until no more noise came from it. Another few months passed and the sword produced sound again. This process of going from soft to loud and loud to soft repeated itself seven times. Eventually, he was able to produce whatever sound he desired, loud or soft. By the time he reached this stage, he counted on his fingers and realized he had been by the sea for six years.
By this time, when Yang Guo trained in the sea's waves with the wooden sword in his hand, the wind generated by his sword could repel the waves and the Divine Eagle, with its frightening strength, could last not more than three stances of the wooden sword. At this point, he realized what the Sword Demon Dugu Qiubai must have felt all those years ago, "With a sword art such as this, who, on this earth, can stand up to it? No wonder Senior Dugu felt lonely and buried his sword away in the deep valley." He then thought, "If Brother Eagle hadn't witnessed how Senior Dugu trained his sword skills, how would I have been able to obtain such a divine skill? I call him Brother Eagle but in reality he is my kind master. When it comes to age, I don't know how old he is, I'm afraid that I could even call it Grandfather Eagle or Grandmaster Eagle."
During his training by the sea, Yang Guo would often ask the passengers on passing boats about a 'Divine Nun of the South Sea' [Nan Hai Shen Ni]. He has asked thousands of sailors and passengers but there was nothing. He knew that seeing Xiao Longnü before the sixteen years was up was going to be a near impossible task.
One dark, windy and rainy day, something stirred in Yang Guo's heart, he placed the wooden sword at his waist and covered himself with his tattered gown. The man and eagle made their way west and from then on, made their way back into Central Plains and roamed the southern region [Jiangnan].