Genesis once bubbled...
is DO NOT THRASH OR PULL!
Figure out WHERE you're entangled and deal with it. When you first sense it, its ALL STOP!
If you do that, then look or feel for the entanglement, you almost always can easily get out of it.
If you ball yourself up the odds go down exponentially with the amount of fighting/thrashing you do.
I dive all the time near severe entanglement risks on and around wrecks - cables, fishing lines, steel leader (particularly nasty!), etc. I feel something hang up once in a while. The trick to not making it worse is to stop and figure out exactly where and how you're caught - as long as you have breathing gas the immediate issue is not an emergency. You can make it one if you damage your gas, your vision, or your ability to get out of whatever snarled you - but the original entanglement is rarely very dangerous all on its own.