Any encounter with an unknown animal could gain a mythological edge from sailors’ stories. After all, the tale grows in the telling. The Kraken had a knack for harassing ships and many pseudoscientific reports (including official naval ones) said it would attack vessels with its strong arms. If this strategy failed, the beast would start swimming in circles around the ship, creating a fierce maelstrom to drag the vessel.
The steampunk objects add value to this undersea world, allowing those entering the bar to imagine themselves the lifestyle and the creatures which play the magical music of the sea with the help of these objects.
When you love steampunk, there is no limit of imagination. Everything just blends together.