Comments by "Simon Nonymous" (@Simon_Nonymous) on "Walter and Electro-Boots - U-Boats of the Future, Today(ish)" video.

24:14 "being able to stay submerged for days at a time"; I appreciate yes it would have enough battery storage to facilitate this, but I didn't hear anything about any new technologies in the Type XXI to scrub the air etc, as this is the other limiting factor. Or did I miss it?
2
@emjackson2289 and you can see it off the A189! I think they also make breathalysers there (possibly.)
1
@onenote6619 yes that seems likely. I don't think it was until nuclear subs that there was enough power to electrolyse water to extract oxygen etc so the XXI would have been as limited as most subs of it's era?
1