Massive air defenses on East Britain?

[maillemaker]

So I'm on my first campaign, off the east coast of Britain.

I'm used to SH3, where you can pretty much sail here with impunity in 1939 and 1940.

But I'm getting hammered by aircraft like it's 1944!

Is this normal in SH5?

I'm using Wolves of Steel mod.

I'm pretty much going to have to stay submerged during the day, which is unusual for so early in the war compared to SH3.

Also, are there mines in SH5?

Steve