Lighting in a mine

So how do you light a shot in a mine? Everyone is wearing full length hi-visibility jackets so any flash will immediately bounce back from he relectors an white-out everything in the picture. It is pitch black and thick mud underfoot ensures that the use of a tripod is out. To get around this, I set the iso to 3200 (h) on a Canon 1DSII and shot using available light - head torches. If you can just get the 'models' to look at each other, they also light each other as in the shot below.