How do I choose the right dive knife?

[a-cut-above]

I am astounded by how astute the responses to the OP have been.

I really like the idea of shears. They cut kelp, line and netting well.
I really like cheap. There is no sense in dying trying to retrieve a dropped knife. However, with an expensive one, you will be more tempted to try to retrieve it.

Right now, I carry a shears and a cut-off serrated steak knife. The blade is cut to 1-1/2 inches, square across the blade and the corners are rounded. I bought a stack of them at the corner hardware store for $5. If it rusts, I just toss it. It cuts remarkably well. In a test, a single pull of 1-1/2 inches cut most of the way through a high pressure hose.
....

How do you carry your modified steak knife?