strantor, Should have asked this in your first thread on this topic but didn't. Why does the mechanical parts of the saw have to be worried about depth and the pressure associated with the depth? All of the mechanical's should be in a pressure vessel(pv), correct? So as long as the pv can withstand the pressure, what is internal to it shouldn't matter. You were a submariner, right, was the subs interior pressure kept equal to the depth pressure? Not trying to be a smarta$$, but a real question on this.