Forget my earlier drysuit test, I have a simpler far more disgusting and accurate test.
1. Side of beef "trim" to desired weight (bouyancy is probably similiar to a person).
2. 40lb lift bag. Roughly the lift capacity of most BCs.
3. Weight belt.
Slice a hole in the beef and secure weight belt through hole with approx. 10lbs of weight to simulate weights worn.
Attach lift bag to belt.
Fire away.
Start out with a heavier weight, say 200lbs. The nearly neutral bouyancy of the meat could be used to compensate for the weight of the diver and a nearly empty tank. Both of which are near neutral in the water, but heavy after the breach.
If you want to get scientific you could wrap it in an old weightsuit for added bouyancy and attach the lift bag directly to the beef and, finally, hit the quick release on the weight belt buckle as you finish filling the lift bag to simulate a panicked rush to the surface.
I wouldn't advise eating the meat afterwards, but if your crazy enough to try this, a little bacteria isn't gonna scare you off.