The archipelago that local humans call it in daily life is a very general range.

It usually refers to an archipelago area that can connect with each other and has human activities at sea. With the continuous development of human civilization, the specific scope is constantly changing.

Before the appearance of the ship girl, local human civilization was on the eve of modern times, and the ability to navigate and explore from the ocean was relatively limited, and the comprehensive exploration of the islands was not completed.

The emergence of ship girls brought about a technological revolution, quickly pushing human society to the industrial age, and human exploration ability also improved rapidly.

However, deep-sea crisis also occurred at the same time. A large number of sea areas frequently appeared due to deep-sea fleets. Attacking any passing ships quickly became a civilized forbidden zone.

As the deep-sea activities shrink rapidly, the only thing that is today's "Central Islands" is left.

The border of the Central Islands is eight large islands, plus dozens of small and medium-sized islands mixed in, forming a roughly oval "island ring".

There are very narrow straits between the islands around the islands, and the deep-sea fleet never lands and attacks. If it wants to enter the Central Islands, it will inevitably pass through these straits.

The ship girls helped mankind and worked hard to defend these important strait passes, eliminated a small number of deep-sea fleets within the Central Islands, and barely preserved the human society of the Central Islands.

Therefore, the island ring originally served as a geographical boundary became the Great Wall of the Central Islands and the Great Wall of the Maritime Protection of Human Civilization.

Today, the entire island ring is called "Island Islands".

The sea areas within the islands are called "inner seas" and the islands are called "inner islands".

The waters outside the islands are called "outer seas" and the islands are called "outer islands".

All the main ports of the Admiral's Mansion are on the side of the islands near the inland sea, or on the sea islands around the island.

At the entrances of all the straits of the Circular Islands, these maritime passes leading to the Central Islands are deep-sea defense forts organized by the Federation.

The main ship girl of the large admiral's palace in the archipelago took turns to garrison in these fortress strongholds, patrolling day and night inside and outside the strait to guard against any deep-sea fleet near the strait.

On the outside of the circular archipelago, an inland area a distance from the coastline, there is a small observation station every 300 to 500 kilometers.

Ordinary Admiral's Mansion or ordinary ship girl is stationed in these observation stations for a long time, monitoring the movements of the deep-sea fleet outside the sea, and informing the main fleet in the strait in advance when they find abnormalities.

Other admiral palaces, commanders, and ship girls can also organize fleets on their own, set out from forts and strongholds, and actively attack the outer sea areas.

Eliminate the deep-sea fleet that may be close to the Central Islands and reduce the pressure on the main fleet stationed in the Strait Fortress.

This kind of offensive military operation, which is actively carried out, is collectively called "attack (deep sea)" by the Federation and the ship girls.

Xu Xingchen's Admiral's Mansion, as the early large admiral's mansion, especially the early admiral's mansion with abundant ships, had undertaken the construction of four strait fortresses and sixteen observation stations.

Today, the ownership of these facilities is still owned by Xu Xingchen's Yunhai Admiral's Office, but most of them are entrusted to other Admiral's Offices through the Federation.

The offshore facilities that the Admiral’s Office in Yunhai are still directly managed and controlled, leaving only one coastal observation station, but the largest observation station built by the Admiral’s Office.

It is built against the mountain. On the top of the mountain is a towering observation tower, and at the foot of the mountain is a fortress camp with a military airport.

The camp wall built on the basis of the low mountains of the coast is at the strength of the real military fortress level, and is full of shore artillery and anti-aircraft artillery.

The base is more than 300 kilometers away from the capital military port, and is directly connected to each other by road and railway. The capital military port is on the inside of the circle of islands, and the offshore observation base is on the outside of the circle of islands.

If the pier cannot be built outside the sea, the main base is still more than ten kilometers away from the seaside, otherwise it will be another military port in the Admiral's Mansion.

This observation station is more suitable than an offshore observation and warning station.

The Xu family compound is gradually deteriorating due to lack of money to maintain, but the observation base is still in good condition.

Xu Xingchen wants to attack the deep sea, of course, starts from his own base, with complete facilities and supplies available at will, and the corresponding personnel cooperate tacitly and can be kept confidential from the outside.

Therefore, after letting the Chongqing seniors send the written announcement, Xu Xingchen took his ship girls directly and took a transport plane to the offshore observation base.

It was noon now, and Xu Xingchen, who had not eaten, chewed some vacuum-packaged food on the plane. The ship girls adjusted the ammunition distribution through supply resources.

All the commanders of the Admiral's Office have run away or been fired. Now the staff in the port area and base are ship girls.

The ship girl in charge of the overseas observation base is named "Zhongshan". The prototype is the gunboat Zhongshan ship from the Republic of China era. The ship girl is a petite little girl with a very serious expression.

After receiving the news that Xu Xingchen was about to attack, she prepared four military off-road vehicles, brought the latest observation reports, and waited next to the airport apron.

An hour later, the transport plane Xu Xingchen and the main ship girls landed at the airport, and Zhongshan immediately came to report the situation:

"Admiral, the car is ready. At the same time, according to the recent observation report, there are currently about seven groups of 23 deep-sea fleets within a 100-kilometer coastline. You can see the report for details..."

"Thanks for your hard work."

Xu Xingchen took over the report from Zhongshan:

"I'll get in the car and watch slowly. Let's go quickly. Within two hours, we will eliminate these twenty-three deep seas!"

"clear!"

The main players who had completed the transformation agreed in unison with enthusiasm and followed Xu Xingchen to the car quickly.

"Two hours to eliminate? No, admiral, etc.—"

Xiao Zhongshan, who followed, was obviously stunned. He stepped on his left foot to the toe of his right foot, and suddenly staggered and almost fell flat:

"I just reported the observation and found that I did not ask everyone to directly eliminate these deep seas! These deep seas do not need to be eliminated. They do not tend to approach the coast, nor to approach the straits. They are just wandering aimlessly and wandering for several days. It is not worth it to damage the sisters to eliminate them..."

Zhongshan, who is usually serious, said a lot at a fast speed, for fear that Xu Xingchen would misunderstand what he meant.

It happened that Yixian passed by Zhongshan, reached out to hold the little sister who almost fell down, and said with a smile:
Chapter completed!