I always carry 2 things that will cut cable...that stuff is no joke. Here there is much discarded cable, long line mono, ect. that can grab you in a hurry, much more so on the rigs than anywhere else you can imagine. You only get one chance to get out and you better make it count. My sea snips have saved my ass more than once after dropping my knife into the abyss...when it comes to safety lean towards overkill instead of not quite enough.
