Are there any submarine based RPGs?

[Kannik]

I think Blue Planet is the way to go, I've had a quick read of looks pretty interesting. They're just so underrated in my opinion

This is what I love about the RPG space: so many games for so many genres and play environments. I dove into this thread being in the dark of this particular kind and now I've learned there's a school of submarining RPGs swimming around. Now I want to take a gander at Blue Planet to see what it's all about.