This looks like a great way to die. While I agree that many divers, untrained in wrecks, are able to safely make swim throughs, I would strongly disagree with your definition of a swim through. A swim through is where you can clearly see the exit before you enter, there are no entanglement hazards, the area is big and open enough for two divers swimming abreast and the exit can be easily reached at a normal pace in less than 5 seconds. It should also be noted that anyone attempting a swim through should have an excellent handle on buoyancy control. I would also caution, that while some techniques apply, training in wrecks does not qualify one for caves and training in caves does not qualify one for wrecks.
Which is exactly why I went on to outline the risks that you pointed out here. I am not advocating it, but the rules allow it. If you are going to quote someone, at least use the whole post so it isn't taken out of context.
 
				 
  
						 
  
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		
 
 
		
 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		