RetroGaming Shorts Part 070 - Battle Shark
Battle Shark 1989 (Taito arcade)
More retro art/setting inspiration! Battle Shark wasn't popular enough to get home ports, so unless you happened to run across it in arcades you probably missed it. But the aesthetic is pretty interesting and different.
Submarine games were generally less common, but, say, the aesthetic of In the Hunt will feel familiar because of Metal Slug. Battle Shark's aesthetic is worth checking out.