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 . U-boats, commanders and dates , Heinrich Zimmermann, 3–11 July (sunk) , Adalbert Schnee, 3–20 July , Werner von Schmidt, 3–21 July , Heinz Hirsacker, 3–21 July , Werner Schulte, 3–21 July , Karl-Ernst Schroeter, 3–21 July Ships hit by this Wolfpack Avila Star At 00:36 on 6 July, after chasing her for five hours, U-201 hit the unescorted 14,443-ton British Blue Star Line passenger ship Avila Star with two G7e torpedoes 90 miles east of São Miguel, Azores. Another torpedo was fired at 00:54 and failed to explode, but another, four minutes later, delivered the coup de grâce. The ship capsized and sank an hour later. The master, 66 crew and 17 passengers were lost, and the remaining 112 (93 crewmen, 6 gunners and 13 passengers) were later rescued. Cortona At 00:22 on 12 July, the 7,093-ton British merchant ship Cortona, dispersed from Convoy OS-33, was struck by a torpedo from U-116, and three minutes later by another from U-201. Another torpedo from U-201 struck amidships at 00:41 and caused the ship to sink after about an hour. Of the crew, 29 men and 2 gunners were lost, while the master, 18 crew and 4 gunners were picked up in their lifeboat ten days later by the destroyer . Port Hunter At 01:47 on 12 July the 8,826-ton British merchant ship Port Hunter of Convoy OS-33 was struck by a torpedo from U-582. The ship, whose cargo included ammunition and depth charges, suffered several heavy detonations, and sank within two minutes. 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 after seven hours in the sea. Shaftesbury At 09:45 on 12 July, the 4,284-ton British merchant ship Shaftesbury dispersed from Convoy OS-33 was hit by two torpedoes from U-116 and sank in 15 minutes. 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 second