From the Daily Mail:
The group were enjoying the aquatic sights when suddenly they heard a dolphin cry and the bottlenose dolphin swam in their direction. Mr Laros (the diver in question, who I'm calling Scuba Steve) told KITV how he soon noticed that the dolphin's movements were inhibited because it was entangled in fishing line and a hook was lodged in its pectoral fin.
The mammal allowed the human to work to help the dolphin break free. 'I was trying to unwrap it, I got the line fishing hook out of the pectoral fin. There was a line coming out of his mouth. But, the line wrapped around his pectoral fin was so tight and he had cuts both front and aft,' said Laros.
'I was worried if I tugged on it, it might hurt him more. I was able to cut the fishing line and unwrap it.
What a great story, even if he didn't get 100% of it. The fact that a wild animal had the cognitive thought to recognize a solution to its problem by "asking" a "strange" animal for help is absolutely incredible. What have you done to impress me lately river otters?
Source -> http://www.dailymail.co.uk/news/article-2266794/Stricken-dolphin-asked-Hawaii-diver-help-Moment-mammal-stuck-fishing-line-pushed-scuba-instructor-waited-patiently-freed.html
Earlier links about Dolphins -> http://www.dannyfinnegan.com/2012/02/that-lot-of-dolphins.html & http://www.dannyfinnegan.com/2012/03/stranded-dolphins-helped-by-beachgoers.html