Relatively few ships are preserved beyond their useful life, due to the high cost of maintaining them against the ravages of the elements. Most are broken up and sold for scrap, while a relative handful are sunk as naval target practice, scuttled to create artificial reefs, and so on. Some survive because of historical significance, but more often due to luck and circumstance. Since an old ship tied up at dockside, without attention, still decays and eventually sinks, the practice of recent years has been to form some sort of preservation society, solicit donations from governments or private individuals, organize volunteer labor from the enthusiasts, and open the restored ship to visitors, usually for a fee.