Position: 89 06.6' N, 140 44' W, temperature - 16 C, air pressure 1017 hPa, wind 15 knots from SE. Ice drift 0.4 knots towards southeast. Shooting seismic reflection all day. Audun discovered a new 3 meter wide crack in the ice only 5 meter behind the hovercraft in the morning. The crack stopped widening and closed later in the day with some shear motion. Audun packed up the 3.5 kHz echo sounder in case we had to relocate. We are on top of Lomonosov Ridge approaching the edge on the Makarov Basin side.