Does anyone know where I can find the floating harbors?

[KingStevenofEarth]

So, I've been playing a lot since the update, but I have been unable to figure out how to build a floating harbor. I looked through every research tree, and I've looked through what ships I can build at the start, and I can't find it. I've played multiple games never being able to build a floating harbor. Does anyone know where I can find them? Is it a national focus that I have to complete?

I've tried as multiple countries and nothing.

 

[CaptinObvious]

I think it was naval invasions 2, It's a piece of naval kit IIRC

 

[Longshanks51]

Naval research. 1940 landing craft unlocks floating harbours.
I know, i had the same problem, its in the details, not a separate research.

 

[KingStevenofEarth]

Well, that would explain how I keep missing it lol thanks