The Concordia is resting in two places on a submerged rock formation, which is holding it in place. It’s unlikely, but stormy weather could destabilise it and cause it to slide into deeper water. This would lead to a fuel spill if pumping was under way at the time, or if the fuel tanks broke as a result.
Will the Costa Concordia become an oil-spill disaster? - environment - 25 January 2012 - New Scientist
