OK, this puts my own manta ray video to shame.
This video was taken at what I believe is the same location where I have now twice gone diving at night to see manta rays. It is a famous spot off the Kona coast where several dive companies set up bright lights to attract plankton, which in turn attract manta rays--which themselves attract divers and snorkelers who pay to gain access to the site, of course. This video shows how a nighttime manta ray dive a couple weeks ago turned into a dolphin rescue.
Bottlenose dolphins are intelligent creatures, so I wouldn't be surprised if this dolphin, whose fin and mouth were tangled with fishing line and hook, purposely sought out this large group of humans in the hope that one could help. Once one of the divers started to untangle it (around 3:30), the dolphin certainly looked like it was trying to hold still for him. Federal law technically prohibits "lay people" from touching or getting too close to marine mammals, but in this case I think it was a good call: the dolphin was seemingly asking for help (with a problem caused by humans in the first place), and the divers couldn't exactly explain that it would have to wait for a NOAA-sanctioned diver to arrive. Anyway, I think it's a heartwarming video. Enjoy.