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Step on a Crack . . .

What seems like an optical illusion is actually a sign of how dangerous working on coastal sea ice can be. WHOI senior scientist Al Plueddemann and engineering technician Amy Kukulya were working out of Barrow, Alaska, testing a new under-ice-recovery net-capture system and acoustic docking capabilities with a REMUS-100 autonomous underwater vehicle (AUV). The team discovered to their surprise that one of the floes they had recently crossed on snowmobiles had undergone some not-so-trivial changes. (Photo by Amy Kukulya, Woods Hole Oceanographic Institution)