Pushing a truck into a river... ?

Cannot comment on a TV program as I haven't seen it, however what really happens is as follows. As you may have heard, some time ago due to the explosion on the chemical factory in China, many tons of benzol got into the Sungari river, which flows into the Amur river. Now the huge benzol spot is approaching Khabarovsk. To protect town's water supply, temporary dams had been built on the branch of the Amur that actually feeds the town. They'll be demolished when spot passes by. Surely no one wants to hold the chemicals - we don't want them to freeze into the ice. It had already been decided that fishing will be banned on Amur for two years...