In 1985, the Nella Dan was trapped in sea ice for several weeks while undertaking a marine science voyage. During the time it was trapped, iceberg drift was measured in the region, tracking the movement of several icebergs relative to the ship. Iceberg movements included mt biscoe angle, bearing, and ship position so can get rotations with redundancy. Observations were done several times a day. The physical logs are archived at the Australian Antarctic Division.

Handdrawn maps plotting the ships position over time, with notes recording the sea ice and icebergs observed for each plotted point. Also includes sketches of the ice edge and some fast ice positions for the area around where the ship was travelling. The maps are archived at the Australian Antarctic Division.