I used to have to carry the various explosives for any explosive ordnance disposal team that might embark on the boat one of the items I had to stock for them was linear shape charge rolls. one just cut to length a piece of the stuff prime with a blasting cap and it would easily cut through steel plate in excess of 3/8 inch. that was a full 12 years prior to 9/11 and the boat I was on didn't require any of the real neat stuff they'd play with.