Let me preface this response with the following:
I love Busse's, and I love big choppers.
I've done extensive technical diving in Lakes Superior and Michigan.
The thing is, you don't chop underwater.
You want a knife that will cut very aggressively-serrations are great.
Your main mission will be to extract yourself from entanglements-
a real problem in a Wreck Diving scenario.
The other problem is that a large Busse will become part of your weight
system- you'll have to use trim weight to compensate for it.
I dive with at least 3 knives, on the calf, on computer console, on the BC,
on stage bottles where used.
You want a knife that will cut a 3/4 or 1" rope in 2 or 3 saw motions.
The problem is most dive knives are crap- especially 300 series stainless.
If you get something in 400 series you get a much better knife.
The last dive knife I bought was a SOG Seal Pup.
( Yeah, I know- yaak ).
But in a dive environment it's a good cutter.
I ground the tip flat for 1/4", less chance of negating your exposure suit
or bleeding in a rescue, or re-sheating.
My .02
Hey Jerry, Dive Infi?!?!?!