Have to say this does fit the title as all the sounds except fro the drums have an underwater feeling to them actually. The wet synth and bass just flow along very smoothly and create a very nice song. Could see this as an excellent dance song or maybe as a tune for an underwater boss battle in a really hard game as well.
The overall flow just seems to tell its own story as if you had just gotten underwater and you have to navigate the sewers and a few dirty areas to make it back to the surface to survive. Just as you come to the exit a boss appears and blocks your way. Defeating it is the only way out.
Overall, a pretty solid beat but the bomb sound effect kind of got overused in some places, nice job.