Submersible Battleships

[audit1]

@Cheshire_Human

US Navy, prior to WWII, Argonaut and Nautilus (or maybe Narwal) were originally designed as “submarine cruisers”, with dual 4" guns. The idea didn’t work out. They were actually USED as submirsible cargo or troop transport vessels. I’m just going by memory, here. Someone’s going to get on Google and tell me I’m wrong. Likely they will be correct, and I’ll be full of excrement.

USS Argonaut was a minelaying submarine, though she had 2 6" guns.

Narwal and Nautilus were the ones you were thinking about.

[Elendil_s_Heir]

The Japanese in WWII also had subs that carried small aircraft in airtight deck hangars: Type B1 submarine - Wikipedia

[Cheshire_Human]

@audit1

USS Argonaut was a minelaying submarine, though she had 2 6" guns.

Narwal and Nautilus were the ones you were thinking about.

Yes, now that you mention it, that sounds better. See, I said I was probably full of it:D