It looks like you're referring to a specific fan project or a lost media artifact: (1983) — potentially a short film, OVA, or a video game tie-in that someone has "remastered." However, there is no officially recognized Doraemon anime or film by that exact title from 1983 in the standard Fujiko F. Fujio catalog.
Would you like help finding a subtitle file or a comparison between the original DVD and the remastered version? Doraemon Underwater Adventure -1983- REMASTERED...