How very tragic
The only positive being that he lost his life doing what he enjoyed most.
In my area of the UK fisherman off the coast occasionaly get mines off the two world wars entangled in their nets. The clear guidance is to attach a marker buoy and decouple the nets from the boat.
What do the majority of them still do though ?
They leave the nets attached and hang about waiting for bomb disposal to arrive.
I suspect/fear that one day a sudden swell will push the mine into making physical contact with the trawlers hull and, the rest will be history as they say.