Would you care to elaborate Sir?
I am aware of the fact of nearly all underground photography being on a wide angle setting, I think its rare to see anything taken at more than a 35mm focal length or digital equivalent.
Difficult one really: I think there may be a current trend is for a bit more backlighting, with associated silhouettes.
I think we're also seeing a bit more creative use of lighting now that people are generally happy with digital photography in the dark and as lighting power improves.
Certainly, I can do things that I couldn't do two years ago, be it lighting larger chambers or illuminating underwater.
This is also rather useful in that the increased availability of higher-powered lights has raised overall quality of photography, which will prove a useful record of the present for the future.
The people issue may be because use of more powerful lights enables shots to be taken more quickly - and this means people don't get bored being asked to stand still for 10 minutes whilst a chamber is illuminated by a Maglite!
Hello again darkness, my old friend...