You shoot the air cylinder the shark has in it’s mouth and blow up the shark.
Kinda messy but fun.
I used to go shark fishing in the Atlantic with a group of five crazy Italians that were all merchant seaman. Crazy was an understatement. I was the only non immigrant, but they treated me like a brother as I kept them out of jail and won a big tax court case for them.
The biggest shark we landed was a 10 ft Hammerhead.
We hooked onto something that towed our boat for quite a while and broke 300 lb test fishing line with steel leader. We joked that we snagged a submarine. 😁