I like that diver. The dolphins are so intelligent, beautiful. I like that he recognized the issue, took the time to take care of the dolphin. Maybe, things like this keep happening, they might learn to trust some of us.
I used to be an avid scuba diver. I "did it all" and eventually got away from it for family reasons. Anyway i quit carrying the dive knife because all of the liberal laws about concealed weapons. Most state and national parks ban diving with a dive knife either for fear that you are a ninja freedom fighter in disguise, will terrify women and children with your crocodile dundee blade or that you will deface the park. %~} so i started carrying a set of ems shears on my chest BC rig. Turns out it cuts fishing line better than a knife, is less bulky and also is safer.
I never ran into that and I carried three knives, a res-q, a dive model and one at the waist. I seethe sense in the EMT shears, but I can't see using them as a pry bar if needed.