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Island of Vis in Croatia has one, legacy of Yugoslavia, you can swim in. It's a fun experience.
Sub pens have been a thing since the middle of the previous century. https://en.wikipedia.org/wiki/Submarine_pen

I wouldn't be surprised to learn King's Bay or Kitsap also have "mysterious caves", although not-so-mysterious reinforced concrete seems cheaper and more common, and a quick google makes it seem like I'd have to do image searches on Яндекс or 百度 to find them...

(One of the sillier things about not having disbanded the cavalry until after I was born is that my country had bunkers which contained horse stalls and manure tips.)

No pens apparent from Google Maps unless the lift bays are reinforced (Faslane's isn't?), so I guess the USN is confident in their local air supremacy.
The Royal Navy apparently considered an underground base for its missile subs to be located in the Loch Glendhu area in the North West Highlands. However, the US Navy wanted its submarines to be based closer to an airport and the Royal Navy wanted to be close to the US Navy...

I'm rather glad Loch Glendhu is left unspoiled but it does mean the current infrastructure for UK nuclear submarines is rather close to Glasgow and the largest population centre in Scotland.

Source: https://www.amazon.co.uk/Silent-Deep-Royal-Submarine-Service...

NB That book is worth it just for the description of the infamous Perisher course, let alone the stories about Rickover...

royal navy is a joke these days. always wonder if a Falklands happened now would they remain british?
FYI: There's a lot of parallels between the WW2 Pacific War and the relationship between US and China today. Neither Imperial Japan nor the CCP were willing to take "No." for an answer in their colonial quests.

We're at the brink of a military conflict. I wouldn't be surprised if the PLA imprisons Xi in the next few months and sends diplomats to the US to avoid war. Subtract a couple months if the Three Gorges Dam fails, which could happen any minute.

For people keeping score, China has 4 carriers (with underpowered engines on their J-20 fighters), and 2 large troop carriers for invading Taiwan. No battle experience.

The main wrinkle is the US Nov. Presidential election timing and results. If Trump wins again, I expect Xi to topple soon after.

So block the entry way and the whole facility is out of action?

Seems a significant single point of failure.

If you're in their territorial waters, you're in trouble.
Perhaps an appropriately aimed missile...
Having this out in the open is great.

Letting citizens of other countries near the South China Sea know about the purpose of the islands raises general awareness of the consequences of certain actions.

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There was a submarine cave in the James Bond movie Die Another Day