9 months ago - Secret Master - Direct link
I see a lot of good responses here, but I want to chime in with a few of my own.

him_15 said: Let’s say for Germany is it really worth to put resources into submarines.

That depends on what you mean by "put resources into submarines."

Germany starts with 1936 subs and a little guy named Donitz. Against the AI on normal, those two factors, plus Germany's starting dockyards (and the occupied ones in France/Benelux/Poland) are enough to give you a decent chance of neutralizing the British merchantmarine by June of 1941.

Why is this the case?

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Donitz starts with the Sea Wolf trait. This unlocks silent hunter, torpedo expert, and loading drill master from Day 1. He doesn't have to work for them. And Donitz can hypothetically command all submarines if you organize them into 10 flotillas. So, from day 1, Germany has a skill 5 admiral that fires torpedoes every three hours instead of 4, has a +10% torpedo hit chance, and -15% chance to reveal subs when they fire. Oh, and a flat 20% increase to sub attack just from being a Sea Wolf. On top of that he has a skill of 5 in attack for another 25% to attack.

From day 1, Germany can produce these subs (if you spend five minutes getting the required naval XP to design a new sub):


1691695776294.png

Sounds weak, right?

But wait, Germany has the Raiding ship designer. Let's burn 150 PP and apply it:


1691695845817.png

So, with starting techs, a starting admiral, and their raiding designer, Germany is no longer Germany, but it's now the Romulan Star Empire:

1691696022112.png

(What Donitz might look like in an alternate timeline)

You should be able to build around 100 of those subs (not counting existing ones at game start) by the time France falls. That should be plenty of subs to eviscerate British shipping.

If you take the time to grab 1940 submarine techs, you might as well be building this:

Romulan gif.gif

Britain's troops overseas will be out of supply. Britain's rubber imports will be decimated. Britain will be starving for fuel especially because sending ships out to escort the convoys will consume fuel even as you sink it. You will watch as the British AI keeps putting more and more dockyards on convoys until there's no other naval construction.

So, I don't think you need to put much effort into convoy raiding in order to be successful with it. The most effort you might put into it is exercising ships to get the requisite naval XP for a new 1936 sub. And maybe stopping construction on the surface ships and focusing just on subs. But that's fewer mouse clicks than planning Sea Lion.