1919, was purchased and turned into an amusement pier, and is still visible at Seacliff State Beach, near Aptos, California, . It broke up during a January 2017 storm. The SS McKittrick, launched in 1921 in Wilmington, North Carolina, later became the , a gaming ship off Coronado, California, that ran aground on December 31, 1936. The wreck is periodically exposed by strong storm tides. The vessel aground in the surf at Shipwreck Beach on the north shore of Lanai, Hawaii is the wreck of YOG-42, , a concrete gasoline barge built for the US Navy in 1942 and placed in service in 1943. The wreck is often misidentified as a Liberty ship. The remains of the Col. J. E. Sawyer can be seen near the in Charleston Harbor, , South Carolina. The wreckage of the is visible slightly south of Bimini Island in the Bahamas, . It is a popular snorkeling site and boating landmark in the area. Europe One of the few concrete ships built for but not completed in time to be used in World War I, the SS Crete Boom, lies abandoned in the River Moy, just outside the town of Ballina, County Mayo, Ireland, and is considered of much interest to the area's many tourists. A concrete barge, the Cretetree, is beached in the harbour of the Isle of Scalpay near Tarbert, Harris, Scotland, . It was built by Aberdeen Concrete Ships, and completed in 1919. The Purton Hulks, a collection of vessels intentionally beached at Purton during the first half of the twentieth century as a method to prevent coastal erosion, includes eight ferro-concrete barges. A large collection of abandoned concrete barges are seen at River Thames in Rainham, London. The wreckage of the , a small Nazi-era German tanker, is visible in Dąbie Lake, near Szczecin, Poland. It was sunk during a Soviet air raid on 20 March 1945. In the late 1950s Polish authorities decided to lift it and tow it to another location to be converted into swimming pools, but during that operation it began sinking again, so it was abandoned in shallow water, where it has remained since. During the German occupation of Greece (1942–1944) during World War II, the German Army built 24 concrete cargo vessels for transporting goods to various Greek islands, including Crete. These were constructed in the Perama shipbuilding area of Piraeus. After the war, many