the icefin was deployed -lrb- and retrieved -rrb- the vehicle through a 12-inch diameter hole through 20 meters of ice and record the first footage of what lies on the seabed below the ross ice shelf .
the icefin was deployed -lrb- and retrieved -rrb- the vehicle through a 12-inch diameter hole through 20 meters of ice and another 500 meters of water to the sea floor .