Set your volume to 0 for music. Trust me. Either that or its your system volume needs upping.
as for the second one. Its a stock bug... should only be apparant when you reload a save game while submerged. The game can be screwy when you reload it while submerged. The way to counter this... is to press either D, or S and then they will vanish from the conning tower as though you are diving even though you ARE already submerged and running on electrics...
though, you can have a laugh with this... have you ever fired your deck gun and flaks under water?
