Hai (English : "Shark") was a wolfpack of German U-boats that operated from 3 to 21 July 1942 in the Battle of the Atlantic during World War II.
They attacked the Liverpool to Freetown, Sierra Leone convoy OS-33, sinking eight ships for a total of 61,125 gross register tons (GRT).
The master, 68 crew, 14 gunners, and 5 passengers were lost, the only survivors being three crewmen who had been sleeping on deck, who were blown into the water and survived by clinging to wreckage until rescued by HMS Rother after seven hours in the sea.
There were no losses among the crew, although the master, Uriel Eynon, was taken prisoner by the U-boat, returned to Germany, and held at the Milag Nord POW camp.
The next morning the U-boat returned to the scene of the attack and found the stern of the ship still floating, and sank it with 61 rounds from her deck gun.