Original sentence: Because bottom trawling involves towing heavy fishing gear over the seabed it can cause large scale destruction on the ocean bottom.The primary sources of impact are the doors, which can weigh several tonnes and create furrows if dragged along the bottom, and the footrope configuration, which usually remains in contact with the bottom across the entire lower edge of the net.There have been cases of naval ships using a trawl net to catch intruding submerged divers (see here).Trawling can cause significant damage to the seafloor, coral shattering, boulders being dragged along the seafloor causing damage to habitats and removal of seaweed can all be unitntentional side-effects of trawling.Trawling is one of the environmentally disputed ways to fish
Edited sentence: Because bottom trawling involves towing heavy fishing gear over the seabed at a speed of several knots, it is INCREDIBLY destructive to the ocean bottom.Coral shatters, boulders dragged along crush animals and their habitat and seaweed is ripped out of the ground.Not only does it catch thousands un-targeted fish, almost always killing what ever is caught, but it also destroys the seafloor below.The primary sources of impact are the doors, which can weigh several tonnes and create furrows when dragged along the bottom, and the footrope configuration, which usually remains in contact with the bottom across the entire lower edge of the net.There have been cases of naval ships using a trawl net to catch intruding submerged divers (see Anti-frogman techniques#Mechanical devices to capture submerged divers).Trawling is one of the all time worst ways to fish