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Nautilus

223 Parts (38 of which are ballasts)
Luckily kragle is not needed, give it a sec for buoyancy to take affect.
Feel free to remove the ballasts (giant batteries) for a cool looking ship

"The nautilus is a no go dude, it's f***ed" - Lewis

Pretty good Ship
Pretty good Sub
Cutting edge auto roll stability

Kinda neutrally buoyant
Use thrust and pitch to ascend and descend (like a plane)

By all means experiment with weight distribution and ballasts.
Maybe even add additional props on the vertical axis to force a decent.