After working in O&G previously, some of the technology surrounding it still amazes me. Take the submersible hot-welding habitat probably used here, or one like

After working in O&G previously, some of the technology surrounding it still amazes me. Take the submersible hot-welding habitat probably used here, or one like it. We have found a way to (somewhat safely) put humans on the bottom of the ocean, in a box, around a metal pipe full of explosive gasses at pressure, for the purpose of shooting molten metal at, or cutting into that metal pipe. What are we doing?