Zheng He's Chart, whose full name is "From Bao Shipyard to Longjiang Official Water to Foreign Countries", records in detail all the hydrological routes from Liujiagang to East Africa during Zheng He's seven voyages to the West, including the weather, landforms and even customs and folklore of major countries along the way. Every word and even every stroke is the brainchild of that generation of navigators.

Its comprehensive documentation and accurate data collation can be called a treasure of civilization in the history of human navigation. To describe it as "priceless" is not an exaggeration.

But such a major cultural treasure disappeared without a trace after the middle of the Ming Dynasty. Only in the Ming Dynasty spear Yuanyi's "Wubei Zhi", its relevant drawing catalogue is retained.

There are two theories about the whereabouts of Zheng He's navigation chart, one of which is that it was burned by Liu Daxia in the Ming Dynasty, and the other is that it was destroyed by Qianlong.

"Shuyu Zhou Advisory" recorded: "In the Chenghua room, there are nobles who cater to the wishes of the above, cite the story of Yongle to tell the story, and ask Zheng He to send an envoy to the water. The Ministry of War Shangshu Xiang loyal officials were not allowed to enter the warehouse to inspect the old case, and the cover was first hidden by Liu Daxia in the car driver. ”

This passage proves that Liu Daxia did hide Zheng He's navigation chart, and he also said to his immediate boss Xiang Zhong with confidence: "Three guarantees to go to the West, spend hundreds of thousands of money and food, soldiers and civilians die and tens of thousands, even if the treasure returns, what is the benefit of the country, this is a special maladministration, and the minister should admonish it." Although the old case exists, it should also be punished. ”

From these records, it can be seen that Liu Daxia did hide the navigation chart, but there is no way to know whether he burned it or not, but from the "Wubei Zhi" written by Mao Yuanyi, the relevant drawings and catalogs are retained, and this map is still there later.

When Qianlong was compiling and revising the "Siku Quanshu," he compiled 3,475 books, and there were 67,666 books that were destroyed, totaling 73,556 volumes.

Li Nan was noncommittal about these two statements, because Zheng He's navigation chart was now in his hands.

Li Nan didn't know where Wang Zhi got Zheng He's navigation charts, but according to the temperament of Ming officials, as long as they spent some money, then whether it was from the military department or from Liu Daxia's descendants, it should not be too difficult to get some navigation charts that no one valued.

Zheng He's navigation chart was priceless in the hands of Wang Zhihe pirates and maritime merchants, and in the eyes of the Ming people who forbade the sea, it was estimated to be worthless.

Li Nan has been reading Zheng He's handwritten logbook these days, and he has discovered many secrets that the world absolutely does not know.

As for why Zheng He went to the West seven times, whether it was the East or the West, countless people gave different interpretations.

Generally speaking, experts and scholars believe that Zheng He's voyage was to promote trade and deter neighboring countries, or that he was ordered by Zhu Di to go to sea to find the escaped Jianwen Emperor Zhu Yunwen in order to prevent future troubles.

After reading the logbook written by Zheng He, Li Nan found that the above explanations were incorrect, because from reading between the lines, he deduced the true purpose of the eunuch of the Three Treasures.

Why did Ming Chengzu Zhu Di send a eunuch to lead the fleet to sea?

Because eunuchs have no family background, they are the most loyal group to the emperor, and Zheng He's purpose of going to the West seven times is actually the same as Xu Fu of the Qin Dynasty, all in search of the elixir of life.

"Rushing all day long is only for hunger, so that I can have food and clothing and clothing;

Food and clothing are sufficient, and there is a lack of beautiful wives in the room;

married a beautiful wife and a beautiful concubine, but had no land to build on;

put tens of millions of hectares of fertile land, because he has no official position and is afraid of being bullied;

The three and four products are still too small, and the first and fourth products are still low;

One day he was the prime minister, and he wanted to be the emperor again;

It is not enough to be a king, and it is still immortal;

I haven't woken up from a dream, and I've returned with a long coffin! ”

This "Song of Discontentment" vividly depicts the greed and desire of human beings, and the world is indeed as written in the song, never satisfied.

Qin Shi Huang, the first to unify China, can be described as a generation of Ming monarchs, and Zhu Di, the ancestor of the Ming Dynasty, is also a king who is both civil and military. But even these two emperors who are majestic and strategic, and have the power to kill countless lives, after they ascend to the throne, they also want to live forever.

I don't know why, in Chinese legends, the gods seem to live on the immortal mountains overseas, so whether it is Xu Fu or Zheng He, their goal is the vast sea.

Xu Fu should have failed in the end, because Li Nan knew that Qin Shi Huang did not appear, but Zheng He was really half successful in the end.

In the "Zibao Shipyard Sailing from Longjiang Official Water to Foreign Countries Zhufantu" does not record anything about seeking the elixir of life, Li Nan only found Zheng He's account of this matter after studying for several months and finally cracking the "Crossing the Ocean and Pulling the Stars".

This "Crossing the Ocean and Drawing the Stars" seems to be just a bamboo slip made of golden bamboo, but when it is opened flat, a very intricate secret map will appear.

This picture is made of golden bamboo as the base, and it is firmly inlaid with seventy-seven pieces of bamboo pieces of different sizes that can be moved in the picture, foreigners may not know this kind of thing, but Li Nan knows that this is actually an enhanced version of a Huarong Dao game.

Huarong Dao is an ancient Chinese intellectual game, which is known as "the three unnegotiable in the world of intellectual games" by foreign intellectual experts together with the Rubik's Cube and independent diamond chess with its varied and tireless characteristics.

The Huarong Dao game has a board with twenty small squares, representing Huarong Dao. There is a two-square-long exit below the chessboard, which is for Cao Cao to escape. There are ten pieces of different sizes on the board, representing Cao Cao, Zhang Fei, Zhao Yun, Ma Chao, Huang Zhong and Guan Yu, as well as four pawns. "Huarong Dao" has dozens of formation methods, such as "horizontal knife immediately", "close at hand", "five levels", "water leakage", "Xiaoyan out of the nest" and so on. There are only two small squares on the chessboard, and the game is to move the chess pieces through these two squares to move Cao Cao out of Huarong Dao with the fewest moves.

The Huarong Dao game doesn't seem difficult, but Zheng He's "Crossing the Ocean and the Stars" turns ten chess pieces into seventy-seven, which increases its difficulty countless times.

Li Nan is not a strange person in the mathematical world, and when he just crossed over, he could only be regarded as a middle-aged person, but after years of experience and systematic strengthening, both his physical fitness and the speed of his brain have improved. Therefore, after several months of research, he finally unlocked the first lock of this diagram and obtained a suicide note left by Zheng He.

"On the twelfth day of April in the sixth year of Xuande, our fleet came to a bay, where there were a large number of extremely beautiful mermaids, but unfortunately these mermaids were not as docile as the legend, and they launched a ferocious attack on the fleet......

"On April 18, the sixth year of Xuande, after losing half of the ships, the fleet finally came to the new continent, and we finally found the Fountain of Youth......"