The Christina O

. Christina O is one of the world's longest private yachts at 325 feet 3 inches (99 m). She was originally a Canadian River class frigate called HMCS Stormont and was launched in 1943. She served as a convoy escort during the Battle of the Atlantic and was present at the D-Day landings.After the end of the Second World War she was one of many surplus naval vessels and Greek shipowner Aristotle