1st December 1921
U.S. destroyer USS DeLong runs aground at Half Moon Bay, California in heavy fog.
First manned airship filled with helium instead of hydrogen takes flight as a U.S. Navy blimp C-7 makes a journey from Norfolk, Virginia to Washington, D.C. and back.
Ship Losses:
Comer (United Kingdom) The coaster foundered in the Firth of Forth. Her crew were rescued by a tug.
USS DeLong (United States Navy) The Wickes-class destroyer destroyer ran aground in Half Moon Bay, California. She was salvaged, decommissioned, and scrapped.