Some people like to live life on the edge, facing their fears and trusting everything on the thinnest veneer of protection. After all, when you consider that the most integral part of a shark diving experience is the resiliency of your cage, how it's constructed and laid out suddenly becomes an important consideration. You only need to do a quick search of YouTube to see what happens when cages are poorly constructed. Cages assembled with nuts and bolts are clearly to be avoided. But in a welded cage, details are vital. Both MIG (metal inert gas) and TIG (tungsten inert gas) are solid techniques but only TIG welding, carried out by a consummate professional, is tough enough to withstand the charge of a great white. Facing your fears in the ocean, hundreds of miles from land, is not the place to make your safety checks.