I do not have any sympathy for the man and the punishment that he may face. But if this is not the first time he has dumped them that way what environmental hazard got created. Tubes obviously have a hole in them otherwise I can't see anyone trying to push a bobber that size under 20" of ice. His problems will likely make it to wherever he did his scrapping, home, shed, property. I vision lots of yellow plastic tape, guys in white hazmat suits, black shiny cars and guys with badges.
You did the right thing stopping something that just should not happen.