Specimens of giant amphipods were collected in the Kermadec Trench and reported in early. Too soon to say yet whether the new specimens are also Alicella gigantea but I've added the species here anyway (nominated by Ely Wallis.).
Report of the new find in the media (many articles) see: http://scitechdaily.com/researchers-discover-supergiant-amphipods-in-the-kermadec-trench/
The Supergiant Amphipod Alicella gigantea Chevreux from the North Pacific Gyre
J. L. Barnard and Camilla L. Ingram
Journal of Crustacean Biology
Vol. 6, No. 4 (Nov., 1986), pp. 825-839
(article consists of 15 pages)
Published by: The Crustacean Society
Stable URL: http://www.jstor.org/stable/1548395
Giant Amphipod from the Abyssal Pacific Ocean
Hessler, et al.
Science 11 February 1972: 636-637.