I served on a submarine for 20 years. We took a new construction submarine down to the sound trials area and we surfaced for a swim call. We had a couple of guys fishing for some relaxation and they ended up catching 2 sharks. We broke out a barrel, cut it in half, and fastened some grates to it. We then used some charcoal we had onboard for a great bbq in the ocean. We purchased some charcoal at a port-o-call so we could do a cookout at sea with sliders (burgers for land lubbers).