Well done!! BZ.
Two suggestions;
1. One of those spray mist thingamujigs used on hot days for 'topside' to simulate spray.
2. If the depth charge sound/effect can be linked to your joystick's ForceFeedback then "translated" to the walls of your 'sub' it might simulate an attack on your sub if you get my meaning.
All in all pretty damn cool and kudos too to your wife for being a good sport.
