Your absolutely correct about the flooding but I guess I was thinking mostly about the large connections between battery pods and the main pressure vessel. Lights don't need to be critical to be included in the concept of my thoughts. The hose and cable should be a very close fit and would probably require grease to slide the cable through the hose. This would make for minimal compression of the hose. And your also very right that this idea would be good for ambient compensated components.
If external motor seal failed or a light fixture imploded, or other damaged occurred that caused to one of external electronically connected items to fail then wouldn't you start flooding? Also the ends that I have see which are compressed onto the hose ends have rather sharp edges on the portion of the fitting that is inside the hose. Since the hose is being squeezed and not pressurized then I wonder it that might cause the hose to be cut by the fitting before it was supported by the wiring? I guess you could fill the hoses with epoxy to prevent them from compressing but they would no longer be conduits and there is no guarantee that it will hold the pressure the day you remove a light with a rock wall. I do think they will make great conduit connections for ambient compensated external devices such as thrusters.
Doug Jackson