I added two depth charge blasts to the original Scirè underwater shot. I like to use different software and interchange files between them so I had to render again the entire shot with Lightwave, exporting all the necessary render passes. Then I used a script I wrote some time ago to export the Lightwave camera into Blender in order to get the same camera lens and animation. Then I added volumetric blasts with Blender and finally I composed each pass and layer with Nuke.