I must first interject a few rules: No guns or explosives. You can sink whalers, driftnetters, and toxic-dumping ships by scuttling them. Using explosives could risk life and would definitely be very counterproductive with the media. If you do get caught with explosives, you can expect to do long time.
One other warning: Scuttling ships is not a college prank. It can be deadly serious. Get caught in Norway and you'll do time. Get caught in Taiwan and after a forced interrogation, they might deposit your body at the bottom of the harbor.