Getty Images When a humpback whale became entangled in a craypot line off Kaikōura last week, witnesses described it thrashing in distress for ten minutes before eventually freeing itself. It was a fortunate outcome. Elsewhere in New Zealand and Australia, similar cases have required complex disentanglement operations involving trained rescue teams, multiple vessels and specialist equipment. In one recent Australian case, rescuers removed hundreds of metres of fishing line, hooks, rope and buoy