entangled. just like in a straight jacket. 19 years on the water i've never seen anything like this. you have to make a decision. are you going to try to intervene yourself? physically intervening, certainly, carries a risk. >> fishbach and the group can't turn their backs on the animal. they radio the mexican authorities but know it could take hours if not days for someone to arrive, and by then it could be too late. fishbach takes a quick dip in the water to assess the situation under the surface. then he returns to the boat for a knife like this one. he wants to try cutting some of the net free. it's a decision that seems to make his son galen nervous. >> daddy's going to try to help it, galen. [ crying ] >> i'm scared.