Yeah! Soon we will be the first city that will have more sunken ships than fishes hahahahahaha! It is really something authorities should deal with as there are so many ships (sunken or abbandoned) that soon as the ship routes increase (due to increased needs) we won't have any free place for ships to berth. Except the fact of danger there is also pollution. Rusty metals in the bottom of the Pireaus sea is not the best example of ecologist plan.