Owners of old ships frequently abandon them, with their cargos and crews. The crews may be trapped, unable to leave the ship. Once in a rare while, the ship's cargo eventually explodes.

I will make a radical proposal: require ship owners to post a sufficient bond with an international organization, in case the ship can't pay its fees or becomes abandoned. Without that bond, the ship should not be allowed to leave port, and any country can seize it and sell or scrap it.