In the 17th century, the Pearl River was more than 10 times as wide as it was in later generations. In later generations, Haizhu District, located in the south of Guangzhou City, with a total area of 90 square kilometers, was just a few small islands on the river in this era.

Therefore, it makes sense that the Pearl River was called "Zhuhai, Zhuyang" by the ancient Guangzhou people, because after leaving the city gate, there are hundreds of square kilometers of river, and it is never an exaggeration to call it the sea.

After a sound of water, Yu Sibao poked his head out of the river.

Yu Sibao's current location is on the Shiziyang River in the middle of the Pearl River, in the middle of the channel. This place has passed the Humen, and there are some scattered small sandbanks on both sides, and those sandbar villages in later generations have still not been formed.

After poking his head out on the river, Yu Sibao did not stop, but turned his head and swam behind him. In a few moments, he climbed a soft ladder and climbed onto the boat out of breath.

Anchored on the river, a flat-deck barge.

The "Barrier Breaker" barge has its own power system, and various equipment is also installed on it, which is a special vessel specially used to clear obstacles in inland waterways. At this moment, the barrier breaker has dropped anchor in front of the front, left and right, and stopped steadily in the center of the river.

Yu Sibao, a young man, came to Taiwan with his father Yu Chengde. The Yu family relied on Yu Sibao's diving skills to get silver from the sunken ship, and then killed the local ruffian who kidnapped the Yu family's little sister, and finally ran away with the whole village to join Cao Dashuai.

Today, Yu Chengde is already a successful fishing company owner, and Yu Sibao, who is naturally talented and has superb diving skills, was recruited by the port authority early and became a professional diver.

Yu Sibao has been in Guangdong for half a year this time. After Cao Zongbing opened the Huangpu Military Port and the Special Economic Zone in Guangdong, he came to the Pearl River Estuary with the ship and began to do the work of clearing obstacles.

The wrecker work that needs to be used by divers is naturally the reef on the river. In this way, it took half a year for Yu Sibao and them to clean up from the mouth of the Pearl River to the Shiziyang in the middle of the Pearl River.

In recent times, the Barrierbreaker has targeted Leper Reef in the Lion Ocean.

As its name suggests, the Leper Reef is shaped like a scar on the head of a leprosy, not a piece, but a group of reefs.

The location of this reef is in the middle of the Lion Ocean, the location is treacherous, hidden from time to time, and it is easy for non-local captains to get on the road, and in previous years it often caused boat accidents. This time, Yu Sibao's task is to get rid of this reef.

"How's it going, have you figured it out?"

As soon as Yu Sibao climbed onto the edge of the boat, the captain Lao Tian led someone to unload the equipment on his body, then wiped the water on the diving suit, and wrapped a large scarf to keep warm.

After taking a sip of the warm tea handed by others, Yu Sibao nodded excitedly and said, "Uncle Tian, the location is clear, I'll charge medicine next time!" ”

"But you have to be careful, if there is a problem, pull the safety rope." Lao Tian is a middle-aged man in his forties, with a wrinkled face, always speaking with a bitter face, and he doesn't seem to be at ease about anything.

"No problem, just look at it!"

In this way, Yu Sibao rested for half an hour, and then he put on his diving goggles again, picked up the compressed air bottle, and went down the ladder down the river.

This time he was even more dangerous when he got into the water, because in addition to the safety rope around his waist, he had to carry a thick fuse and an explosive bag mounted on the top of the fuse.

The bag containing diatomaceous earth explosives and the fuse were sealed and waterproof. The inner core of the fuse is black powder, the second layer is a waterproof layer, the third layer is a cotton thread reinforcement layer, and the outermost layer is a waterproof paint.

Since black powder has its own oxygen booster, under normal circumstances, as long as it can be ignited in water, it can continue to burn in water. Of course, the premise of all this is that Yu Sibao can smoothly install the explosives at the root of the reef.

The barge's current location is more than ten meters upstream of the reef. After Yu Sibao entered the water, the safety rope was also controlled at this distance, so that he could just sink under the water and touch the root of the reef.

Trying to control his body in the current, Yu Sibao slowly walked to the base of the reef like an astronaut, and pressed the explosive bag he was holding in his right hand on a pit that he had been optimistic about before.

He then breathed steadily, then pulled the rope from his waist and patiently secured the explosive pack. After checking it, the young man smiled through his goggles - he had never imagined that there were bottles in the world that could make people breathe in water, and oh yes, they could compress such things as "air" in them.

Taking two steps back, Yu Sibao pulled the safety rope twice. At this time, the boat that received the signal began to slowly retract the rope with a winch, and then Yu Sibao pulled the rope and returned to the bow of the boat effortlessly.

The next moment, when Yu Sibao removed his goggles and nodded with his thumb out, the captain ordered the detonation. Soon, a stream of flame followed the fuse into the water. After waiting for dozens of seconds of anxiety, with a loud "boom" sound, a white column of water two or three meters high exploded on the surface of the river, accompanied by some small black stones.

The port authority workers, who had long been familiar with this situation, had retreated to the stern of the ship at this moment. After the water column and gravel fell into the river, the captain Lao Tian patted Yu Sibao on the shoulder a few times, and then he ordered: Continue to go into the water to investigate.

Since the traversers could not create a complete set of explosive equipment and consumables that could be electrically detonated in the water, the only way to clear the reef was now to use this dangerous method. The fuse can only be packed one at a time, and it cannot be detonated at the same time, so after the explosion just now, the people on the boat cannot guarantee that the reef will be completely shattered, so they must continue to go into the water to investigate.

It is also dangerous to enter the water at this time, because the reef may be in a precarious state and will collapse and hurt people. So Yu Sibao went into the water this time with a strong light, and began to explore a little distance from the reef.

The end result was not bad, the columnar reef had split into several pieces and collapsed at the bottom of the river. This is equivalent to completing the task, Yu Sibao continued to advance at the bottom of the river, and came to the bottom of the next reef to start surveying.

After another quarter of an hour of busyness, Yu Sibao returned to the ship again. Due to the great consumption of stabilizing his body in the river water, after getting on the boat this time, Yu Sibao could not go into the water for the next few hours, he could only rest and change to another diver to work.

Just when the young man was holding a vat of hot soup and sitting leisurely at the stern of the boat to watch the scenery, the Fuyuan fleet came from downstream.

"Hey, didn't the big ship go down in the morning, why did it come back so soon?"

Seeing the blue-gold ship in the distance, the employees on the ship were a little puzzled: "Today's training time is short?" ”

"No, no, it's not the Zhenman!"

The next moment, the sharp-eyed Yu Sibao instantly jumped up from the deck, and while waving vigorously into the distance, he shouted: "It's our new ship, new ship!" ”