Way back when SH3 was under development there was a thread about what we'd like to see in the new subsim. Someone replied that he'd be happy with AOD with SH2's graphics. I stole that quote and used it many times.
These days I've grown fond of the mods from SH3, the crew from SH4 and the graphics of SH5, but yes, I still play Aces Of The Deep from time to time. There's something about being able to avoid sonar by sitting on the bottom (and getting stuck in the mud) that tickles me.
AOD FOREVER!
