Getting the anus cut out without making a mess is always a challenge. Here we are just being successful. 
The only thing we “wasted” on this pig. We did not clean the intestines and use them for sausage. We did donate the innards to the wildlife on the farm who ate well that night. 
This was a tricky bit because we were dumping the innards while trying to save the liver and kidneys and also the heart and lungs for anatomy class. 
Success! A clean cavity ready to wash out and then split.