On 24 August 1921, "R.38" (designated ZR-2 by the USN) was destroyed by a structural failure while in flight over the city of Hull. It crashed into the Humber Estuary, killing 44 out of the 49 crew aboard. At the time of its first flight it was the world's largest airship. Its destruction was the first of the great airship disasters, followed by the Italian-built US semi-rigid airship "Roma" in 1922 (34 dead), the French "Dixmude" in 1923 (52 dead), the British R101 in 1930 (48 dead), the in 1933 (73 dead), the USS "Macon" in 1935 (2 dead), and the German "Hindenburg" in 1937 (36 dead).