I remember when I first played San Andreas and had the ability to swim underwater. It was never in any previous GTA game and when it was included it was a nice inclusion. Now with GTA V coming and allowing for a whole new world underwater, it seems weird to me that they couldn't include swimming underwater in GTA IV. I bet they had it planned but scrapped it for limitation reasons. I wonder if there's mods out there that allows swimming underwater. I'll have to check that out when I get my laptop.