"Our transport fleet supporting the Soviet Union was attacked again." At the White House, Roosevelt was sitting in a wheelchair and pondered in front of a large-scale high-definition world map, and heard the words of his assistants around him.

When Marshall spoke, his face was expressionless and showed a calmness, but his fingers were trembling slightly, and his mood was absolutely uneasy at this time.

Cargo ships supporting the Soviet Union were repeatedly attacked, which is no longer news, but this time is different from before.

In the past, the attack was on the Arctic route, and almost after passing the Bering Strait, it was the most dangerous sea area that was easily ambushed, but what about now?

In order to avoid ambushing on the Arctic route, the formation did not take the Arctic route, and planned to arrive at the Soviet port in the Far East to unload the goods and then transport them over land.

As a result, in the southern waters of the Kamchatka Peninsula, they were suddenly attacked, which completely broke their dreams and the Far East route was not easy to go!

What's next?

How to support the Soviet Union?

Especially, the most different from the past is that the submarines this time are quite huge in number.

"We have repeatedly studied the attacks on the Arctic route and can confirm that on the Arctic route, there are very few submarines underwater, no more than three, and maybe even only one, because we have never seen two submarines appear at the same time. Because the other party's underwater navigation ability is particularly outstanding, we think there may be three."

Marshall continued to analyze to Roosevelt: "But in the southern part of the Kamchatka Peninsula, we encountered a large number of submarines. According to our estimates, there were about twenty. They came up like wolves, and they came up to bite the cargo ship formation. The warships that were on the escort mission were sunk immediately."

The huge number of German submarines appeared in the North Pacific region, which is definitely not good news for the United States.

Although these submarines have been attacking the Soviet fleet of cargo ships that aided the Soviet Union, who knows whether they will come to attack the ambush of the US fleet?

Moreover, under such rampant submarine activities, they could no longer continue to transfusion blood to the Soviet Union, so the Soviets would definitely not be able to hold on.

"This is really bad news." He took a cigarette and continued: "It is impossible to take the land route. If we can't take a ferry in Alaska, we must open the sea transportation line."

During World War II, there was a feat of road transportation, which was the huge fleet of automobiles on the Yunnan-Burma Highway, supporting the battle of the Chongqing government, but how many kilometers were there?

If you go directly to land from the United States, cross the Bering Strait, and transport it to Moscow, it will cross half of the earth, and the journey is more than ten times that of this one. At least half of the entire convoy needs to transport fuel, and it is absolutely impossible to complete it.

It is impossible to take land, and air transport cannot be used. The United States does not have enough transport aircraft, and the resources consumed by air transport are no less than those by land.

Therefore, it is still a waterway and a sea transportation line needs to be opened.

"Moscow means that too," said Secretary of State Hull: "The Soviets asked us to dispatch the navy to escort their cargo ship formations."

The Soviet Navy was weak and almost still had its hometown in the Tsarist era. The main fleet was no longer on the Western Front, and the Far East fleet was not good at all. In this case, the Soviet Union could only seek help from the United States.

Hearing this, Roosevelt frowned: "No, we don't have enough navy to open this transportation line."

Now, the US Navy is going to fight with the island navy. Seeing that the island navy is about to take root in the Hawaiian Islands, where can it have the ability to provide escort ships to the Soviet Union?

"No, we don't have that many warships." Roosevelt said: "The escort formation must be solved by the Soviet Navy itself."

If there is a previous battleship guarding the formation, then the German submarine will have a lot of concerns. However, how can the main battleship be provided to the Soviets? Who knows whether it will be consumed by accident? The United States cannot afford it.

"We can provide merchant ships to the Soviets, and we can provide as much as we sank the bombs." Roosevelt said: "This is already our biggest bottom line."

In later generations, the German wolf pack tactics were eventually crushed by the Allies. As for the reasons, there are many statements, such as the improvement of the Allied anti-submarine technology, the skillful operation of their captains, etc., but there is also a simple calculation method behind it. The United States has a strong industrial foundation and the cargo ships it produces are consumed more than they consume, so the Americans can withstand.

Now, Americans can only use this method. With the start of war machines, American industry has fully entered the wartime system. When powerful industrial machines are activated, they can be produced any amount of consumption.

The United States provides merchant ships, and provides as much new as it loses, which is already the maximum.

"No, not enough. If we only provide merchant ships, this kind of ending will not be avoided." General Nimitz said worriedly: "If we do not increase the anti-submarine forces, we can only send prey to the Germans."

As the admiral, Admiral Nimitz is an expert.

"But we must not provide escort fleets to the Soviets, we do not have that many troops," said Roosevelt.

"Yes, we cannot provide escort fleets, but we can provide aviation." Admiral Nimitz said: "We can provide professional anti-submarine aircraft to the Soviets. If deployed on the Kamchatka Peninsula, we can take care of the nearby waters within 500 kilometers."

The United States' technology is extremely advanced, and how to detect underwater submarines is also a key point for them. After research, they have developed magnetic abnormality detectors and equipped them on the Pby-5 "Catalina" seaplane.

Long before the attack on Pearl Harbor, this system was tested. A Pby-5 took off from Rhode Island, caught a submarine, and successfully verified the magnetic abnormality detector system.

Later, the Naval Research Laboratory confirmed that the Pby-5's radar system could receive and send electromagnetic pulses without using bulky attached antenna systems.

In addition to this magnetic abnormality detector system, there is also a sonar buoy.

Like history, in 1941, the United States developed a sonar buoy, but it was carried by airships. Even if the targets were discovered during patrol, there was not enough time and weapons to attack. This was just the beginning, and there was still some time before practicality.

In short, it is completely feasible for the United States to use aircraft to anti-submarine.

"The Soviets had no suitable pilots to fly these equipment," Secretary of State Hull said, "Their rookies began to go to the Western Front after quick training. If they wanted to fight the submarine, they would need at least dozens of aircraft members, and they would not be able to find them at all."
Chapter completed!