Jabberjaw as a campaign setting for Cyberpunk2020 RPG. The band are of course the Rockerboy character class, possibly using the later Cyberpunk RPG underwater dweller tribe rules for worldbuilding.
Or the Jabberjaw band making their way through the first Bioshock video game settting.
Related from Infocult, here are the ruins of Jacques Cousteau's undersea colony. Maybe the abandoned colony was bought for nothing by Bioshock undersea city founders.