The Franklin expedition collapsed into fragmentation and cannibalism once stranded.

Evidence

The details of what happened next are not completely known, but what is clear is that everyone gradually died. Both archaeological evidence and reports from Inuit locals gathered by the many explorers sent to rescue the expedition indicate that the crew fragmented, moved south, and cannibalism ensued. In one report, an Inuit band encountered one of the crew’s parties. They gave the hungry men some seal meat but quickly departed when they noticed the crew transporting human limbs. — Joseph Henrich, The Secret of Our Success, 106