The I-60 is an ocean-going submarine with a range of 10,000 nautical miles and a corresponding self-sustaining capability, thanks to its huge tonnage volume, with an underwater displacement of 2,300 tons, almost twice that of the U106, while only 25 meters longer than the other side. But the sailing performance of the I-60, both in terms of range and speed and diving depth, was inferior to that of her German cousin, who was a few laps smaller than her.

In the final analysis, it is Japan's lack of technology accumulation, Japan's failure to understand the essence of German design, or the fact that Dr. Zechel secretly kept a hand with the Japanese back then, this kind of thing may not happen, but with the arrogance of German engineers, I should not bother to do this.

Don't look at the fact that Germany lost the First World War so badly, but in front of the Asians, they still hold a special sense of superiority, because no matter how down, they are still proud Germans.

It is said that Japan's submarines finally broke away from the influence of the Holland submarine and became one of the few countries in the world that had the ability to design and manufacture submarines on their own. You must know that until the 21st century, submarine manufacturing is still a cutting-edge technology that only a few countries can master.

Earlier, there were only a few Holland submarines in the combined fleet, and the sailors were trained by the diving team itself. Now that Japan has advanced domestically produced submarines, this training model in the early days is no longer applicable.

At that time, the "Special Investigation Committee on Aircraft and Submarines" within the Japanese Navy came to the conclusion that Japan must train naval officers and men who can operate new submarines as soon as possible, otherwise even if submarines are built in the future, the navy will be unavailable.

As a result, a formal submarine crew training school was established, which was included in the agenda of the Navy Ministry that year. The following year, in 1919, an organization called the Preparatory Committee for the Naval Submarine School was established in Kure Harbor.

At the beginning of the Taisho period, the Japanese Navy was in full swing to build the so-called "86 Fleet" (with eight battleships and six battle cruisers), and the funds were invested in the construction of ships, so that the construction of land facilities was relegated to a secondary position. No matter how important personnel training is, it is always more important than the big ship and the giant cannon on the slipway.

As a result, the Japanese Navy's first regular submarine crew training school, the "Japan Naval Diving School", was placed on an old warship that was close to being decommissioned. That is one of the famous "Three Scenic Ships" of the Japanese Navy, the protective cruiser [Itsukushima].

The so-called "Sanjing Ships" were three cruisers specially built by the Japanese Navy in order to fight against the main battleships of the Beiyang Naval Division, [Zhenyuan] and [Dingyuan], and they were equipped with a 320-millimeter cannon that could penetrate the main armor of the two ships in Dingzhen.

Moreover, in order to install the heavy gun, the hull armor was weakened in the design, and as a result, it was nicknamed "naked warrior with a sharp blade" in the Japanese Navy, and became a joke among officers and soldiers. After the First Sino-Japanese War, these two ships were reclassified as second-class cruisers, and later participated in the suppression of the Boxer Rebellion and the Russo-Japanese Battle of Tsushima, and by 1912, these two old ships were downgraded to second-class coastal defense ships, and only accepted some coastal patrol work, and never performed any combat missions again.

The Itsukushima was in the best condition at the time, and there was plenty of interior and deck space, so the Japanese Navy decided to use it and convert it into a floating submarine school. The Itsukushima was also transferred from a second-class coastal defense ship to a "secret military ship" of the Navy.

In 1921, at the famous "Washington Conference," various countries signed the "Washington Naval Treaty," which aimed to balance the naval strength of various countries.

As a result, the navy had an extra amount of spare money in its hands, and it began to fully devote itself to the construction of the naval land infrastructure. Wu Zhenshou carved out a piece of land on the western shore of the Navy's gunpowder laboratory and began construction of a school building and dormitory to serve as a residence for the new Naval Diving School.

In fact, there is another reason for this, the [Itsukushima] has been included in the list of retired warships, just in order to make up the 4,300 tons of shipbuilding share, the Japanese do not have much choice.

Since then, the Imperial Japanese Navy Diving School has taken root in Kure Harbor and has begun to supply the fleet with submarine commanders and sailors, as well as naval special divers.

However, it is impossible to train qualified ship operators on land alone, and it is necessary to train them in actual operation on real submarines, so the Japanese Navy selects submarines in good condition as training submarines in various diving teams.

The Yi 60 is now such a training submarine, although she belongs to the Sasebo Town Guard, but because it has just undergone a comprehensive overhaul, the ship's equipment needs a period of time to run in, just to undertake the training task. I just came out of the Navy Repair Yard, and I'm not in the best condition.

At this time, the I-60 carried a total of 98 crew members, including the 63 soldiers and officers rated on the submarine itself, as well as the commander of the 28th Diving Squadron, Moriji Kijima, the staff officer of the Naval Diving Team, Shosa Nomura, and the instructor of the Naval Diving School, Captain Takeo Fujiki, and 33 teachers and students of the Naval Diving School.

Thirty-five men more than the rated number of men came out, which was almost impossible in the German Navy, but in the Imperial Japanese Navy it had become commonplace. In order to train and prepare for war, the Japanese Navy Company "Moon, Moon, Fire, Water, Wood, Jinjin" (Japan named "Qiyao", that is, seven planets for a week, namely the sun, the moon, fire, water, wood, metal, and earth, corresponding from Sunday to Saturday. And "the moon, the moon, the water, the fire, the wood, the gold, the gold, the earth and the day, that is, there are no Saturdays and Sundays, which means that there is no vacation and the whole week is devoted to military training." This kind of slogan is shouted, and there is nothing they can't do.

Historically, during the Pacific War, most of the Japanese submarines were overloaded when they sailed, and in addition to some sailors who were ready to be replaced, there were also staff officers, marines, and naval intelligence personnel delegated to various levels of command, and it was rare that there were less than 80 people.

This is also the space in the cabin of a large ocean-going submarine in the sea is large enough, so it can squeeze so many people. Replaced by German ocean-going submarines, even the toilets are used to fill supplies, where is there still room to squeeze in dozens of people, so in history, most of the German submarines are only short of staff, and there are rarely overstaffed.

Because the sea conditions in the Sea of Japan and the western Pacific region are complex, and large storms are often encountered, so the front of the Japanese submarine control tower is designed as a fixed roof, installed with glass windshields and portholes, forming a semi-enclosed bridge structure. From this point of view, the captains of Japanese submarines were much more comfortable than their German counterparts, at least when cruising on the surface, they could have a place to shelter from the wind and rain.

However, this kind of bridge also has a disadvantage, the view is not as clear as the open bridge in Germany, and it will increase a lot of resistance when diving, affecting the speed of the submarine's emergency dive. But then again, the Japanese submarine design has fallen behind again at this time, especially these ocean-going submarines, in fact, there is no such option as a rapid dive, because of the lack of buoyancy reserves, sinking may be a little faster.

"What did you find? Greenhouse. "The commander of the team, Nakasa Kijima, climbed the control tower.

"Oh, Commander, it's a German submarine." Hanafang Shaozo put down the binoculars and pointed to the U106 in front of him and reported loudly.

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