This "thing" I bought is not a scuba knife because the handle is metal and covered with two wooden slabs. It will not survive seawater I guess. But if you think about it, the utlity side of this thing can be very useful for a fisherman or sailor. I didnt mention that it has three nut holes in it. So, it would be helpful in boat engine maintenance for example.

In the process of finding a suitable survival knife or "survival thing", I thought about scuba knives. There are a few good ones that come with a straight edge on one side and a serrated edge on the other and a metal butt for pounding/hammering. Some have a chisel tip which is good for prying. Pretty versatile, but I was still looking for something more versatile, and bigger if possible. If a spouse or friend was trapped in a car wreck for example, a diver knife is too short to be used for prying doors open.