On October 23, 2016 a team of engineers and scientists completed a 45 day expedition to deploy the Nereid-UI (NUI) hybrid underwater robotic vehicle under moving sea ice to explore the Karasik Seamount at 87°N 61°E in the Arctic Ocean, from aboard the F/S Polarstern of the Alfred Wegener Institute, Bremerhaven, Germany. 
The Woods Hole Oceanographic Institution and collaborators from the Johns Hopkins University and the University of New Hampshire developed NUI for the Polar Science Community. NUI is a remotely-controlled underwater robotic vehicle capable of being teleoperated under ice under remote real-time human supervision. The goal of the NUI system is to provide scientific access to under-ice and ice-margin environments that is presently impractical or infeasible. Here are some web sites with more information:
http://www.whoi.edu/main/nui
http://web.whoi.edu/oases-for-life
http://expedition.awi.de/expedition/PS101
https://www.awi.de/nc/en/expedition/ships/polarstern/weekly-reports.html
Dynamical Systems and Control Laboratory
Department of Mechanical Engineering | Laboratory for Computational Sensing and Robotics | Johns Hopkins University
