Try the Water Streams + Exhaust Smoke Combo - it will give you water streaming out of the outer hull vents as well as smoke from your diesel exhaust vents when you are cruising on the surface. Very cool.
http://www.subsim.com/radioroom/down...o=file&id=1538
Lifeboats & Debris will put added debris in the water when you sink something plus add the possibility of survivors in lifeboats appearing to row away from the wreckage.
http://www.filefront.com/13234590/LifeBoatsDebris_v4.7z
JGSME you should already have, it installs with GWX3!