'Seehund' (i) was a U-boat wolfpack operation off the coast of South Africa and in the Indian Ocean (5 February/19 April 1943).

The boats of this wolfpack refuelled and replenished from U-459 in the South Atlantic before moving to their operational area, where the boats then operated singly. Kapitänleutnant Erich Würdemann’s U-506 sank the 5,212-ton British Sabor and 4,768-ton Norwegian Tabor; Kapitänleutnant Hans Pauckstadt’s U-516 the 4,764-ton British Helmspey, 6,187-ton US Deer Lodge, 10,782-ton Free Dutch submarine depot ship Colombia and 3,663-ton Panamanian Nortun; Kapitänleutnant Werner Witte’s U-509 the 4,937-ton British Queen Anne and 7,129-ton British City of Baroda; and Kapitänleutnant Georg Lassen’s U-160 the 7,191-ton US Roger B. Taney, 7,176-ton US James B. Stephens and 4,986-ton British Aelybryn as well as making three attacks on the DN.21 convoy on 3/4 March to sink the 7,166-ton US Harvey W. Scott, sink the 5,961-ton British Nirpura, damage the 10,356-ton Dutch Tibia, sink the 5,087-ton British Empire Mahseer, sink the 7,268-ton British Marietta E, and damage the 4,868-ton British Sheaf Crown.

The DN.21 convoy comprised only 11 ships supported by the corvette Nigella and anti-submarine trawlers Norwich City, Sondra and Viviana which were supplemented, though only after U-160's success, by the destroyers Quiberon and Relentless.

Kapitänleutnant Asmus Nicolai Clausen’s U-182, operating at the same time off South Africa, sank the 7,173-ton British Ocean Courage, 4,836-ton British Llanashe, 7,177-ton US Richard D. Spaight, 5,047-ton British Aloe and 5,838-ton Greek Adelfotis. While returning to Europe, U-182 was sunk on 16 May, to the west of Madeira, by the US destroyer Mackenzie of Task Force 62 escorting the UGS.8 convoy.

The other boats returned safely after replenishing from U-117.