Deep-sea researchers from the Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI) have recovered the underwater robot Tramper, which had been taking measurements at a depth of 2435 metres for nearly 60 weeks – the first long-term mission involving a crawler under the Arctic sea ice.

http://subseaworldnews.com/2017/09/08/awi-retrieves-its-underwater-robot-after-year-long-mission/?uid=42572