[Missing Name]

Whenever I start up a mission, I hear steam as the interior of the boat comes into view. That wasn't unusual, but now it's overlapped several times. It's deafening to the point where I can take off my earbuds and still hear it from across the room.

I've been playing with the sound files, but so far I haven't modified anything related to steam. Any ideas on what could be causing this?

Mods installed:
GWX Enhanced Damage
GWX Lite Harbor Traffic
GWX No Medals on Crew
GWX Captain America's Icons
GWX Axis Mediterranean Aircraft Skins
Enhanced Torpedo Damage
All Weather Guns
Seabed Repair
Rowi58's Flower Corvette
WB's Mission Orders Lite
Q Ships
Bakkel's Type IX Skins
My (Missing Name's) Mod - sh3.sdl HAS been modified, but nothing with steam.