Hello everyone, I'm new here and this is my first post.
I was thinking of building an underground or underwater base.I've read a topic about underwater base and hundreds of reasons why it wouldn't survive but what do you think about underground base?The only problem is getting the air, how would you do it the most practical way?

EDIT: I know you people think it's impossible for an underwater base to successfuly BE under the water but are there theorethical ways of doing it? Say there's a IIIWW and radiation if everywhere on the planet.You could simply in an underwater facility with say water2oxygen transformators and electricity on solar cells.Underwater facility doesn't neccessary mean a glass-made building, you could make it in those rock like shelters which are the size of a mountain or something.
I don't know, throw some constructive ideas.

I wouldn't say that was the only problem, but it's certainly a biggy.

I think the biggest problem with an underwater base is structural integrity. I can think of only two reasons for having an underwater base, one would be military the other research.

Both of these would require a base of this type to be a significant depth below the surface otherwise it would be pointless.

The depth you'd need to go for research purposes it would be unfeasible to build at, you'd be talking 1,000's of metres down.

A military installation I doubt would need to be as deep, the only point of having a base underwater would be to be covert, however that's unlikely to happen either as if it were targeted one good hit could potentially flood the entire facility.

All that said, I think the easiest way would be to have compressed air delivered by submarine, they stay down for months on end with their own supply so I see no reason why a permanent base couldn't do the same on a larger scale.

Thats why an underwater facility would never work as living space. Unless of course you have many chambers that allow for a breach in one cell but still trap the water in the next. Sort of like a Hull with lots of Airtight doors between each chamber. But an organised terrorist attack for example could get past that.

If you have a covert military base deep underwater it would be useless if terrorists knew where it was or even knew it existed.

As for air, a small atomic power plant, smaller than one on a nuclear sub, could supply all the light, heat and air you'd ever need.

we allready got an underwater base NAS New orleans --