submersible

Typical narco-subs are not submersible at all, the bulk of the craft is below water but the conning tower is on the surface at all times.

Now, it better be submersible, very loud, and run on rechargeable batteries that last over 10 hours.

The problems associated with operating a submersible are formidable, even in the best cases here on Earth.

They set up their own radio communications networks and use aerial and submersible drones.

Right, but then what is the point of making a submersible carrier as opposed to launching the UUVs from a traditional surface carrier.

Expect air, submersible, and larger surface units with the same capabilities within time.

If you were to approach the wreck via submersible, I would assume you would not be detectable.

Whereas a very-much-cheaper drone boat of 1-2 meters in size would be harder for other combatants to detect, could travel in novel ways (submersible?

If you need something submersible, it's not a good option though.

Yes, waterproof is submersible and water resistant is rain/shower etc.

They could even be temporarily submersible to weather storms.

Reading that paper inspired me to look into this and I ended up trying to make a submersible with the limited budget I had.

Nothing like this will ever compare with a submersible in terms of "stealth".

This was his 73rd trip into the ocean in a submersible, including 33 dives to the Titanic." He also worked as a truck driver for a while...

(edit: according to Wikipedia, newer narco-subs may be fully submersible, but still probably not for extended periods of time) Also, the Swedish military claims to have had "contact" and detected the craft with several sensors.

Submersible accomodation isn't actually that hard or expensive: You don't have to go very deep to reduce wave action to next to nothing, only 10-20 meters, and you only need to submerge in heavy weather.