Distressing footage shows the incredible lengths Hawaiian rescuers go to every year to disentangle whales trapped in ropes and nets.
Since 2002, the Hawaiian Islands Humpback Whale National Marine Sanctuary has freed more than 20 large whales, removing more than 9,500 feet of line in the process.
As well as fishing gear, the likes anchor lines, scientific apparatus, marine debris and moorings are responsible for such issues.