"According to the report, our ship has entered Peter the Great Bay, approaching Vladivostok at a distance of about 10 nautical miles, and the sea surface 1,000 meters ahead is very full of floating water, and the warship can no longer advance. ”

"Okay, reduce your speed, turn on the bow sonar, and map the topography of the seabed. Pay attention to the vigilance, closely observe the movement of the sea, avoid the Russian patrol vessels, and pay attention to large pieces of ice floe. ”

"At a speed of 5 knots, the bow sonar was turned on and the topography of the seabed began to be mapped. ”

"The SR-64 radar did not detect anything abnormal. ”

...... ......

As the Kunming ship began to draw a topographic map of the seabed, the acting captain Han Chao also breathed a sigh of relief and said, "Notify the special forces to prepare for landing." ”

At this time, in the helicopter hangar of the Kunming ship, Luo Yue was still looking in front of the mirror. What appeared in the mirror was a person wearing a set of Type 07 camouflage combat uniforms, a buoyancy tactical vest, a QGF-11 tactical helmet on his head, desert locust goggles tied directly above the helmet, a Type 95 assault rifle in his hand, and a GP328 walkie-talkie on his shoulder, a typical image of a PLA Marine Corps soldier in the 21st century in the old time and space.

Yang Rui patted Luo Yue's shoulder and said with a smile: "What's the matter, haven't you seen enough?"

Luo Yue couldn't help but laugh and said: "I haven't worn this outfit for almost 4 years, and now that I'm wearing it again, it really seems like I'm back to the past." ”

Yang Rui said: "There is not much difference, at that time you were a member of the Marine Corps, and now you are the commander of the Marine Corps." However, this costume is not a Marine Corps costume now, only in the Special Forces. And there are fewer and fewer of them, maybe in a few years, even the special forces will no longer have such a full set of equipment. ”

Luo Yue also nodded, in this mission, including himself, there were only 3 crossing fighters, if in a few years, all the crossing fighters in the special forces withdrew from the front line, so a full set of modern equipment would indeed not be available anymore.

While the two were talking, another crossing soldier, Zhou Xinghan, the deputy commander of the special forces, came over and said, "The captain has come to order, we can go ashore." ”

Yang Rui nodded and said, "Inform all the team members and prepare to go." ”

After the fleet composed of the Kunming and Huaihua ships set off from Qingdao, it took a total of 7 days to reach the sea area of Vladivostok, and the distance from Qingdao to Vladivostok was about 2,000 kilometers, and at the speed of the two warships, a maximum of 3 days was enough, but because this operation was absolutely secret, it was necessary to avoid the cargo ships that met on the way to the voyage. Of course, because the two warships have advanced radar systems, they can detect ships about 50 kilometers in advance, and they can be fully prepared to avoid cargo ships, which will delay a lot of time, and sometimes in order to avoid cargo ships, the fleet will temporarily hide for several hours.

In addition, the fleet stayed in the waters of Tsushima for another day, of course, drawing up a chart of the waters of Tsushima, because the plan of the East China government was to participate in the war between Japan and Russia during the Battle of Tsushima, and this operation would pass through the Tsushima Strait, so it was natural to survey the sea conditions in the waters of Tsushima Island.

After passing through the Tsushima Strait and entering the Sea of Japan, the sea surface became suddenly open, and the fleet could move at full speed, but the direction of the fleet was all the way to the north, and it was still February at this time, although it had already begun spring, but the spring cold had not yet disappeared, and there were a lot of ice floes in the sea, some of which were even as big as houses, so the fleet had to reduce its speed to less than 10 knots in order to avoid large pieces of ice floes, and also to avoid small pieces of floating water from damaging the hull.

At a distance of about 50 kilometers from Vladivostok, the ice floes in the sea are already very dense, so the speed is reduced to 6 or 7 knots, and the fleet floats in this area, and releases drones to scan and take pictures of Vladivostok at high altitudes, and then transmit the scanned data to the warship to generate a three-dimensional topographic map.

Vladivostok is located at the southern tip of the Muravyov-Amur Peninsula and runs roughly northeast to southwest, bordering the Sea of Japan. The peninsula is bordered by the Gulf of Ussuri to the east, the Amur Bay to the west, the Great Golden Horn to the south, and across the East Bosphorus Strait, to the Russian Island (Lefu Island), and to the outside is Peter the Great Bay.

The port of Vladivostok is located in the Great Golden Horn and is about 7 kilometers long. The width of the bay at the entrance is about 2 kilometers and the water depth is 20~30 meters, and the width of the bay is less than 1 kilometer, and the water depth is 10~20 meters. The bay is surrounded by low mountains and hills, and the southern end of the bay is also protected by Russky Island, which can be said to be a very advantageous port if it is not for the three-month ice period every year.

However, for Russia, Vladivostok is the only outlet to the sea in the Far East, although the coastal areas north of Vladivostok are now Russian territory, but first, the sea conditions are difficult to find such a good place as Vladivostok, and the further north, the longer the annual ice period, so Vladivostok can be said to be Russia's bridgehead in the Far East, its Russian name: Vladivostok means "to conquer the East".

And because Vladivostok is far from the Russian mainland, in order to protect this important city in the Far East, Russia built fortifications in Vladivostok very early, and in 1877, the commander of the engineering forces of the Eastern Siberian Military District, Colonel P. F. Winterberg, designed the fortifications for Vladivostok, and a year later, the first coastal defense works were completed.

After the Sino-Japanese War in 1895, Japan began to rise, and after the alliance between Russia and France, the pressure on the European direction was slightly reduced, and Russia's attention began to turn to the Far East, and more attention was paid to the defense of Vladivostok. The then Chief of Operations, General Kurobatkin, drew up a general plan for the Vladivostok Line, which began in the Amursky Bay, passed through the Muravyov-Amursky Peninsula and finally reached Ussuriysk (Twin Cities).

Colonel K. I. Velicko, a well-known Russian engineering expert and professor at the Nikolai Engineer Academy, designed a land fortification scheme for Vladivostok Fortress, a series of fortress defense systems connected by breastworks and trenches, with 2 kilometers in front of the main defense line as the main fortification area, including No. 1, 2 and 3 spectacle forts, No. 4 and 5 multi-sided forts, No. 1, 2 and 3 outburst forts and positions. In addition, a Russian fortress was built on Russky Island, and fortress No. 4 was built on the adjacent Sapenny Peninsula as a support for the Vladivostok fortress.

The entire defense system is indeed impregnable, but due to the fact that Japan and Russia began to fight each other at this time, Russia invested a lot of resources in Lushun, so until now, the fortifications of Vladivostok have not been completed, and there is a lack of a sufficient number of artillery, and many batteries are still assembled with old-fashioned retreat guns.

The Vladivostok fortress was defended by the 8th Eastern Siberian Infantry Brigade and 3 Cypriot artillery battalions.

On February 22, 1904, the Second Detachment of the Japanese Combined Fleet, under the command of Vice Admiral Hikonosei Uemura, broke through to Usssourisky Bay, shelled Vladivostok, and the shore defense batteries returned fire, but this was a tentative attack, the battle was not long, and neither side caused damage to each other, and the Japanese fleet did not attack Vladivostok again. The main reason was that the main energy of the Combined Fleet was to attack Port Arthur, and it was unable to attack Vladivostok, and after its Vladivostok detachment was heavily damaged by the Combined Fleet and was unable to pose a threat to Japan's maritime supply line, Japan had no plan to attack Vladivostok. Now, although Japan has captured Arthur, the Combined Fleet has to go all out to prepare for Russia's Second Pacific Fleet, and it is simply not free to attack Vladivostok.

The two remaining warships of the Vladivostok detachment, the armored cruiser Gromobowie and the protective cruiser Warrior, escaped back to port, and because they were not well repaired, they were now used as floating batteries.

After the loss of Lushun, Russia also had the intention of improving the defense of the Vladivostok fortress, but at this time Russia had become a mess, and the main energy in the Far East was in Shenyang, preparing for a decisive battle with the Japanese army, so it was unable to improve the defense of the Vladivostok fortress, of course, there was another reason, that is, when Lushun was lost, Vladivostok happened to be in the freezing period, and it would not be completely thawed until at least late March, and it was impossible for warships to get close to the port of Vladivostok. For the time being, the defense of Vladivostok can be put aside.

The reconnaissance fleet of the East China government can only stay on the periphery of Peter the Great Bay, which is about 20 kilometers away from the port of Vladivostok, but for reconnaissance, it is completely sufficient, the bow sonar of the Kunming can basically scan the seabed situation in this area, and the reconnaissance of Vladivostok is completed by drones or helicopters.

In fact, in the old time and space, because Sino-Russian relations were in the best period in history, they sent warships and troops to visit Vladivostok many times, either to conduct military exercises or to conduct friendly visits. Both the Kunming and Luo Yue have visited Vladivostok, and both of them participated in the "Peace Mission" military exercises held by China and Russia, but they did not participate in the same exercise.

But in the old time and space, the Chinese navy had already had a clear understanding of the sea area and the terrain around Vladivostok, where there were reefs, where there were undercurrents, how high the mountains were, and even what the defensive fortresses looked like, and after more than 100 years, these defensive fortresses have become a tourist attraction in Vladivostok. The main engine of the Kunming ship has these data stored in it.

However, after all, it was more than 100 years later, and more than 100 years ago, there are still some differences in details, so it is necessary to re-survey and compare the data.

In one day, the drone has scanned all the terrain of Russky Island, Muravyov-Amursky Peninsula and Ussuriysk (Shuangchengzi), and took a large number of photos.

Luo Yue, Yang Rui, and Zhou Xinghan compared and marked the fortresses, forts, fortresses, trenches, etc. from the data on the map, thus drawing a combat map.

However, although the photos taken from high altitudes are accurate enough, it is impossible to fully reflect the real situation, at least it is impossible for people to fully understand the real geographical situation from these photos, so it is still necessary to send personnel to conduct on-the-spot reconnaissance and surveys, which is also the task of special forces.