Well it was over a year ago, but this was in the mushroom forest biome - look at the top left of the screenshot.

What biome are you in?

Well yeah, but if we're going by all you need then I reckon you don't really need windows, or corridor sections, or observation rooms, or beds...

This hub isn't about easy or simple or just doing what you need , it's something I thought would be fun - like having a seperate seamoth per external base. Sure you can get by with just one but I like the idea of having a few and only using certain ones to go to certain places or pre-customised with certain functions in mind. Ostentatious, big, brash and wasteful; why not when you've got the titantium lying around eh?

At least, I would have done this by now if my saved games ever loaded after I've explored a certain number of map tiles >_< Yay bugs (which I expect).

I mean the upgrades on all the vehicles are easy to swap out. All you need is a wall container and you're good for your Seamoth and PRAWN. Can even keep replacement materials in there.

For 6 Seamoths, of course. One for every day of the week - except on Sundays when you take the Cyclops out for a spin.

Or I suppose now you could have 4 Seamoths and 2 PRAWNs.

Why would you ever even need 6 moonpools?

@Jenja Ink, yes they are, another one of my screenshots here shows what it looks like from the inside. Where the longside of moonpools touch, they make two doorways.

Also @everyone else, thank you! You're too kind, this is in creative after all! I've not done it in survival yet, mainly because eventually my gameworld no longer loads without crashing and I have to start over

are the moonpools connected with each other

When I think undersea base this pretty well covers it,really nice job

Very cool!