I think that as well as row boats there should be little barrel submarines that attach in the same way as row boats but are little submarines with a compass a big glass window and a air meter that if runs out then you start to drown!
Submarines
@armouredyeti13 What would the use be? There isn’t really any reason to to underwater currently minus the shipwrecks and they basically spawn near the surface.
I don’t think I would like a submarine, that rings more Subnautica to me, but I would like a reason to go exploring underwater with maybe one of the old fashioned diving suits and/or a diving bell.
@armouredyeti13 I agree with @KnifeLife. What would be the purpose of a submarine? We don't have enough ocean floor to explore and the bits of the sea we can explore the floor on isn't that far from the surface. Not to mention how would it be attacked by other vessels? Would people just be able to jump into a submarine and do a voyage unharmed? Occasionally coming up for air while at an island?
It sounds like it would be fun to play around with but I just don't see it fitting into the game, not right now at least.
