The Cephalopoda are not typically considered characteristic of the benthic fauna at hadal depths (depths exceeding 6000 m), yet occasional open-net trawl samples have implied that they might be present to ~ 8000 m deep. Previous in situ photographic evidence has placed the deepest cephalopod at 5145 m. The discrepancies between the two have meant that the maximum depth for cephalopods has gone unresolved. In this study we report on unequivocal sightings, by HD video lander, of a cephalopod at hadal depths. The demersal cirrate octopod Grimpoteuthis sp. was observed at both 5760 and 6957 m in the Indian Ocean. These observations extend the known maximum depth range for cephalopods by 1812 m and increase the potential benthic habitat available to cephalopods from 75 to 99% of the global seafloor.

中文翻译：

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第一次在深海深处对头足类动物进行原位观察（八足类：Opisthoteuthidae：Grimpoteuthis sp.）

头足类动物通常不被认为是深渊深度（深度超过 6000 m）的底栖动物群的特征，但偶尔的开放网拖网样本暗示它们可能存在于 ~ 8000 m 深。先前的原位摄影证据已将最深的头足类动物放置在 5145 m。两者之间的差异意味着头足类动物的最大深度尚未解决。在这项研究中，我们报告了高清视频着陆器在深海深处对头足类动物的明确目击。底层 cirrate 章鱼 Grimpoteuthis sp。在印度洋的 5760 米和 6957 米处均观测到。这些观测结果将头足类动物已知的最大深度范围扩大了 1812 米，并将全球海底的 75% 至 99% 的头足类动物可用的潜在底栖栖息地增加了。