Distressing footage shows the incredible lengths Hawaiian rescuers go to every year to disentangle whales trapped in ropes and nets.<br />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.<br />As well as fishing gear, the likes anchor lines, scientific apparatus, marine debris and moorings are responsible for such issues.
