So I continued my way to Plymouth. When I got some Warship contacts...

I plotted intercept course... into my standard position for such attacks...

It was another carrier..

My standard position for attacks...

So I sunk another carrier on same patrol...
But what a shock!!! One of the destroyers drop some depth charges somewhere in the area!!!
Because I was out of torpedoes I went back home...
And again got some warship contacts...

Contacts...
One of them is the destroyer group that still carrier I sunk before...

Protecting the non existent carrier...

And in the other circle... 2 battleships...
I was out of torpedoes so I let them go...
The destroyer group protecting non existent carrier was eventually back on my tail. They always matched my course and speed...

But I got lucky and there was an isle so I crash them into it...
So I went back to base.