technically, both of them are right U-511 is a U-boat but Ro-500 although is still a U-boat, it is under Japanese Navy so the definition would not be U-boat
I don't know whose face made me giggle harder, Bismarck's 'I'm deathly afraid but gonna do this' face, Warspite's, Ark's of Ro that looks like Nonco's Ro.
WARSPITE!!!No, Warspite, she's telling the truth---Now that you mention it, she's quite different from a U-boat...She can sink you with one torpedo strike.Indeed...What...did you say...?Look closely, Ark Royal!This lass is a "Roh-class" submarine.Not a U-boat, see!Told you so!..no, but... that feeling from earlier, it was definitely....A U-BOAT.A-ha!T'was a good joke, for a German!You're unexpectedly quite a jocular fellow, Bismarck!!This kid was originally U-511.